diff --git a/src/main/java/org/kohsuke/github/GHApp.java b/src/main/java/org/kohsuke/github/GHApp.java
new file mode 100644
index 0000000000..97de867ccf
--- /dev/null
+++ b/src/main/java/org/kohsuke/github/GHApp.java
@@ -0,0 +1,177 @@
+package org.kohsuke.github;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.List;
+import java.util.Map;
+
+import static org.kohsuke.github.Previews.MACHINE_MAN;
+
+/**
+ * A Github App.
+ *
+ * @author Paulo Miguel Almeida
+ *
+ * @see GitHub#getApp()
+ */
+
+public class GHApp extends GHObject {
+
+    private GitHub root;
+    private GHUser owner;
+    private String name;
+    private String description;
+    @JsonProperty("external_url")
+    private String externalUrl;
+    private Map<String,String> permissions;
+    private List<GHEvent> events;
+    @JsonProperty("installations_count")
+    private long installationsCount;
+    @JsonProperty("html_url")
+    private String htmlUrl;
+
+
+    public GHUser getOwner() {
+        return owner;
+    }
+
+    public void setOwner(GHUser owner) {
+        this.owner = owner;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public String getExternalUrl() {
+        return externalUrl;
+    }
+
+    public void setExternalUrl(String externalUrl) {
+        this.externalUrl = externalUrl;
+    }
+
+    public List<GHEvent> getEvents() {
+        return events;
+    }
+
+    public void setEvents(List<GHEvent> events) {
+        this.events = events;
+    }
+
+    public long getInstallationsCount() {
+        return installationsCount;
+    }
+
+    public void setInstallationsCount(long installationsCount) {
+        this.installationsCount = installationsCount;
+    }
+
+    public URL getHtmlUrl() {
+        return GitHub.parseURL(htmlUrl);
+    }
+
+    public Map<String, String> getPermissions() {
+        return permissions;
+    }
+
+    public void setPermissions(Map<String, String> permissions) {
+        this.permissions = permissions;
+    }
+
+    /*package*/ GHApp wrapUp(GitHub root) {
+        this.root = root;
+        return this;
+    }
+
+    /**
+     * Obtains all the installations associated with this app.
+     *
+     * You must use a JWT to access this endpoint.
+     *
+     * @see <a href="https://developer.github.com/v3/apps/#list-installations">List installations</a>
+     */
+    @Preview @Deprecated
+    public PagedIterable<GHAppInstallation> listInstallations() {
+        return new PagedIterable<GHAppInstallation>() {
+            public PagedIterator<GHAppInstallation> _iterator(int pageSize) {
+                return new PagedIterator<GHAppInstallation>(root.retrieve().withPreview(MACHINE_MAN).asIterator("/app/installations", GHAppInstallation[].class, pageSize)) {
+                    protected void wrapUp(GHAppInstallation[] page) {
+                        for (GHAppInstallation appInstallation : page) {
+                            appInstallation.wrapUp(root);
+                        }
+                    }
+                };
+            }
+        };
+    }
+
+    /**
+     * Obtain an installation associated with this app
+     * @param id - Installation Id
+     *
+     * You must use a JWT to access this endpoint.
+     *
+     * @see <a href="https://developer.github.com/v3/apps/#get-an-installation">Get an installation</a>
+     */
+    @Preview @Deprecated
+    public GHAppInstallation getInstallationById(long id) throws IOException {
+        return root.retrieve().withPreview(MACHINE_MAN).to(String.format("/app/installations/%d", id), GHAppInstallation.class).wrapUp(root);
+    }
+
+    /**
+     * Obtain an organization installation associated with this app
+     * @param name - Organization name
+     *
+     * You must use a JWT to access this endpoint.
+     *
+     * @see <a href="https://developer.github.com/v3/apps/#get-an-organization-installation">Get an organization installation</a>
+     */
+    @Preview @Deprecated
+    public GHAppInstallation getInstallationByOrganization(String name) throws IOException {
+        return root.retrieve().withPreview(MACHINE_MAN).to(String.format("/orgs/%s/installation", name), GHAppInstallation.class).wrapUp(root);
+    }
+
+    /**
+     * Obtain an repository installation associated with this app
+     * @param ownerName - Organization or user name
+     * @param repositoryName - Repository name
+     *
+     * You must use a JWT to access this endpoint.
+     *
+     * @see <a href="https://developer.github.com/v3/apps/#get-a-repository-installation">Get a repository installation</a>
+     */
+    @Preview @Deprecated
+    public GHAppInstallation getInstallationByRepository(String ownerName, String repositoryName) throws IOException {
+        return root.retrieve().withPreview(MACHINE_MAN).to(String.format("/repos/%s/%s/installation", ownerName, repositoryName), GHAppInstallation.class).wrapUp(root);
+    }
+
+    /**
+     * Obtain a user installation associated with this app
+     * @param name - user name
+     *
+     * You must use a JWT to access this endpoint.
+     *
+     * @see <a href="https://developer.github.com/v3/apps/#get-a-user-installation">Get a user installation</a>
+     */
+    @Preview @Deprecated
+    public GHAppInstallation getInstallationByUser(String name) throws IOException {
+        return root.retrieve().withPreview(MACHINE_MAN).to(String.format("/users/%s/installation", name), GHAppInstallation.class).wrapUp(root);
+    }
+
+}
+
diff --git a/src/main/java/org/kohsuke/github/GHAppCreateTokenBuilder.java b/src/main/java/org/kohsuke/github/GHAppCreateTokenBuilder.java
new file mode 100644
index 0000000000..cf19dd99af
--- /dev/null
+++ b/src/main/java/org/kohsuke/github/GHAppCreateTokenBuilder.java
@@ -0,0 +1,53 @@
+package org.kohsuke.github;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import static org.kohsuke.github.Previews.MACHINE_MAN;
+
+/**
+ * Creates a access token for a GitHub App Installation
+ *
+ * @author Paulo Miguel Almeida
+ *
+ * @see GHAppInstallation#createToken(Map)
+ */
+public class GHAppCreateTokenBuilder {
+    private final GitHub root;
+    protected final Requester builder;
+    private final String apiUrlTail;
+
+    @Preview @Deprecated
+    /*package*/ GHAppCreateTokenBuilder(GitHub root, String apiUrlTail, Map<String, GHPermissionType> permissions) {
+        this.root = root;
+        this.apiUrlTail = apiUrlTail;
+        this.builder = new Requester(root);
+        this.builder.withPermissions("permissions",permissions);
+    }
+
+    /**
+     * By default the installation token has access to all repositories that the installation can access. To restrict
+     * the access to specific repositories, you can provide the repository_ids when creating the token. When you omit
+     * repository_ids, the response does not contain neither the repositories nor the permissions key.
+     *
+     * @param repositoryIds - Array containing the repositories Ids
+     *
+     */
+    @Preview @Deprecated
+    public GHAppCreateTokenBuilder repositoryIds(List<Integer> repositoryIds) {
+        this.builder.with("repository_ids",repositoryIds);
+        return this;
+    }
+
+    /**
+     * Creates an app token with all the parameters.
+     *
+     * You must use a JWT to access this endpoint.
+     */
+    @Preview @Deprecated
+    public GHAppInstallationToken create() throws IOException {
+        return builder.method("POST").withPreview(MACHINE_MAN).to(apiUrlTail, GHAppInstallationToken.class).wrapUp(root);
+    }
+
+}
diff --git a/src/main/java/org/kohsuke/github/GHAppInstallation.java b/src/main/java/org/kohsuke/github/GHAppInstallation.java
new file mode 100644
index 0000000000..3925742162
--- /dev/null
+++ b/src/main/java/org/kohsuke/github/GHAppInstallation.java
@@ -0,0 +1,167 @@
+package org.kohsuke.github;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import java.io.IOException;
+import java.net.URL;
+import java.util.List;
+import java.util.Map;
+
+import static org.kohsuke.github.Previews.GAMBIT;
+
+/**
+ * A Github App Installation.
+ *
+ * @author Paulo Miguel Almeida
+ *
+ * @see GHApp#listInstallations()
+ * @see GHApp#getInstallationById(long)
+ * @see GHApp#getInstallationByOrganization(String)
+ * @see GHApp#getInstallationByRepository(String, String)
+ * @see GHApp#getInstallationByUser(String)
+ */
+
+public class GHAppInstallation extends GHObject {
+    private GitHub root;
+    private GHUser account;
+
+    @JsonProperty("access_tokens_url")
+    private String accessTokenUrl;
+    @JsonProperty("repositories_url")
+    private String repositoriesUrl;
+    @JsonProperty("app_id")
+    private long appId;
+    @JsonProperty("target_id")
+    private long targetId;
+    @JsonProperty("target_type")
+    private GHTargetType targetType;
+    private Map<String, GHPermissionType> permissions;
+    private List<GHEvent> events;
+    @JsonProperty("single_file_name")
+    private String singleFileName;
+    @JsonProperty("repository_selection")
+    private GHRepositorySelection repositorySelection;
+    private String htmlUrl;
+
+    public URL getHtmlUrl() {
+        return GitHub.parseURL(htmlUrl);
+    }
+
+    public GitHub getRoot() {
+        return root;
+    }
+
+    public void setRoot(GitHub root) {
+        this.root = root;
+    }
+
+    public GHUser getAccount() {
+        return account;
+    }
+
+    public void setAccount(GHUser account) {
+        this.account = account;
+    }
+
+    public String getAccessTokenUrl() {
+        return accessTokenUrl;
+    }
+
+    public void setAccessTokenUrl(String accessTokenUrl) {
+        this.accessTokenUrl = accessTokenUrl;
+    }
+
+    public String getRepositoriesUrl() {
+        return repositoriesUrl;
+    }
+
+    public void setRepositoriesUrl(String repositoriesUrl) {
+        this.repositoriesUrl = repositoriesUrl;
+    }
+
+    public long getAppId() {
+        return appId;
+    }
+
+    public void setAppId(long appId) {
+        this.appId = appId;
+    }
+
+    public long getTargetId() {
+        return targetId;
+    }
+
+    public void setTargetId(long targetId) {
+        this.targetId = targetId;
+    }
+
+    public GHTargetType getTargetType() {
+        return targetType;
+    }
+
+    public void setTargetType(GHTargetType targetType) {
+        this.targetType = targetType;
+    }
+
+    public Map<String, GHPermissionType> getPermissions() {
+        return permissions;
+    }
+
+    public void setPermissions(Map<String, GHPermissionType> permissions) {
+        this.permissions = permissions;
+    }
+
+    public List<GHEvent> getEvents() {
+        return events;
+    }
+
+    public void setEvents(List<GHEvent> events) {
+        this.events = events;
+    }
+
+    public String getSingleFileName() {
+        return singleFileName;
+    }
+
+    public void setSingleFileName(String singleFileName) {
+        this.singleFileName = singleFileName;
+    }
+
+    public GHRepositorySelection getRepositorySelection() {
+        return repositorySelection;
+    }
+
+    public void setRepositorySelection(GHRepositorySelection repositorySelection) {
+        this.repositorySelection = repositorySelection;
+    }
+
+    /*package*/ GHAppInstallation wrapUp(GitHub root) {
+        this.root = root;
+        return this;
+    }
+
+    /**
+     * Delete a Github App installation
+     *
+     * You must use a JWT to access this endpoint.
+     *
+     * @see <a href="https://developer.github.com/v3/apps/#delete-an-installation">Delete an installation</a>
+     */
+    @Preview @Deprecated
+    public void deleteInstallation() throws IOException {
+        root.retrieve().method("DELETE").withPreview(GAMBIT).to(String.format("/app/installations/%d", id));
+    }
+
+
+    /**
+     * Starts a builder that creates a new App Installation Token.
+     *
+     * <p>
+     * You use the returned builder to set various properties, then call {@link GHAppCreateTokenBuilder#create()}
+     * to finally create an access token.
+     */
+    @Preview @Deprecated
+    public GHAppCreateTokenBuilder createToken(Map<String,GHPermissionType> permissions){
+        return new GHAppCreateTokenBuilder(root,String.format("/app/installations/%d/access_tokens", id), permissions);
+    }
+}
diff --git a/src/main/java/org/kohsuke/github/GHAppInstallationToken.java b/src/main/java/org/kohsuke/github/GHAppInstallationToken.java
new file mode 100644
index 0000000000..2b6e78fdee
--- /dev/null
+++ b/src/main/java/org/kohsuke/github/GHAppInstallationToken.java
@@ -0,0 +1,87 @@
+package org.kohsuke.github;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.infradna.tool.bridge_method_injector.WithBridgeMethods;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
+
+import java.io.IOException;
+import java.util.Date;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A Github App Installation Token.
+ *
+ * @author Paulo Miguel Almeida
+ *
+ * @see GHAppInstallation#createToken(Map)
+ */
+
+public class GHAppInstallationToken {
+    private GitHub root;
+
+    private String token;
+    protected String expires_at;
+    private Map<String, String> permissions;
+    private List<GHRepository> repositories;
+    @JsonProperty("repository_selection")
+    private GHRepositorySelection repositorySelection;
+
+    public GitHub getRoot() {
+        return root;
+    }
+
+    public void setRoot(GitHub root) {
+        this.root = root;
+    }
+
+    public Map<String, String> getPermissions() {
+        return permissions;
+    }
+
+    public void setPermissions(Map<String, String> permissions) {
+        this.permissions = permissions;
+    }
+
+    public String getToken() {
+        return token;
+    }
+
+    public void setToken(String token) {
+        this.token = token;
+    }
+
+    public List<GHRepository> getRepositories() {
+        return repositories;
+    }
+
+    public void setRepositories(List<GHRepository> repositories) {
+        this.repositories = repositories;
+    }
+
+    public GHRepositorySelection getRepositorySelection() {
+        return repositorySelection;
+    }
+
+    public void setRepositorySelection(GHRepositorySelection repositorySelection) {
+        this.repositorySelection = repositorySelection;
+    }
+
+    /**
+     * When was this tokens expires?
+     */
+    @WithBridgeMethods(value=String.class, adapterMethod="expiresAtStr")
+    public Date getExpiresAt() throws IOException {
+        return GitHub.parseDate(expires_at);
+    }
+
+    @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD", justification = "Bridge method of getExpiresAt")
+    private Object expiresAtStr(Date id, Class type) {
+        return expires_at;
+    }
+
+    /*package*/ GHAppInstallationToken wrapUp(GitHub root) {
+        this.root = root;
+        return this;
+    }
+}
diff --git a/src/main/java/org/kohsuke/github/GHEvent.java b/src/main/java/org/kohsuke/github/GHEvent.java
index 970b6afbf7..8ad6368fe5 100644
--- a/src/main/java/org/kohsuke/github/GHEvent.java
+++ b/src/main/java/org/kohsuke/github/GHEvent.java
@@ -23,6 +23,8 @@ public enum GHEvent {
     GOLLUM,
     INSTALLATION,
     INSTALLATION_REPOSITORIES,
+    INTEGRATION_INSTALLATION_REPOSITORIES,
+    CHECK_SUITE,
     ISSUE_COMMENT,
     ISSUES,
     LABEL,
diff --git a/src/main/java/org/kohsuke/github/GHRepositorySelection.java b/src/main/java/org/kohsuke/github/GHRepositorySelection.java
new file mode 100644
index 0000000000..afba38aaa2
--- /dev/null
+++ b/src/main/java/org/kohsuke/github/GHRepositorySelection.java
@@ -0,0 +1,22 @@
+package org.kohsuke.github;
+
+import java.util.Locale;
+
+/**
+ * App installation repository selection.
+ *
+ * @author Paulo Miguel Almeida
+ *
+ * @see GHAppInstallation
+ */
+public enum GHRepositorySelection {
+    SELECTED,
+    ALL;
+
+    /**
+     * Returns GitHub's internal representation of this event.
+     */
+    String symbol() {
+        return name().toLowerCase(Locale.ENGLISH);
+    }
+}
diff --git a/src/main/java/org/kohsuke/github/GHTargetType.java b/src/main/java/org/kohsuke/github/GHTargetType.java
new file mode 100644
index 0000000000..42a23d8726
--- /dev/null
+++ b/src/main/java/org/kohsuke/github/GHTargetType.java
@@ -0,0 +1,24 @@
+package org.kohsuke.github;
+
+import org.apache.commons.lang3.StringUtils;
+
+import java.util.Locale;
+
+/**
+ * App installation target type.
+ *
+ * @author Paulo Miguel Almeida
+ *
+ * @see GHAppInstallation
+ */
+public enum GHTargetType {
+    ORGANIZATION,
+    USER;
+
+    /**
+     * Returns GitHub's internal representation of this event.
+     */
+    String symbol() {
+        return StringUtils.capitalize(name().toLowerCase(Locale.ENGLISH));
+    }
+}
diff --git a/src/main/java/org/kohsuke/github/GitHub.java b/src/main/java/org/kohsuke/github/GitHub.java
index 002fda9b1e..23973f3546 100644
--- a/src/main/java/org/kohsuke/github/GitHub.java
+++ b/src/main/java/org/kohsuke/github/GitHub.java
@@ -115,6 +115,12 @@ public class GitHub {
      *     <dd>Specify oauthAccessToken, and optionally specify the login. Leave password null.
      *         This will send OAuth token to the GitHub API. If the login parameter is null,
      *         The constructor makes an API call to figure out the user name that owns the token.
+     *
+     *     <dt>Log in with JWT token
+     *     <dd>Specify jwtToken. Leave password null.
+     *         This will send JWT token to the GitHub API via the Authorization HTTP header.
+     *         Please note that only operations in which permissions have been previously configured and accepted during
+     *         the GitHub App will be executed successfully.
      * </dl>
      *
      * @param apiUrl
@@ -132,7 +138,7 @@ public class GitHub {
      * @param connector
      *      HttpConnector to use. Pass null to use default connector.
      */
-    /* package */ GitHub(String apiUrl, String login, String oauthAccessToken, String password, HttpConnector connector, RateLimitHandler rateLimitHandler, AbuseLimitHandler abuseLimitHandler) throws IOException {
+    /* package */ GitHub(String apiUrl, String login, String oauthAccessToken, String jwtToken, String password, HttpConnector connector, RateLimitHandler rateLimitHandler, AbuseLimitHandler abuseLimitHandler) throws IOException {
         if (apiUrl.endsWith("/")) apiUrl = apiUrl.substring(0, apiUrl.length()-1); // normalize
         this.apiUrl = apiUrl;
         if (null != connector) this.connector = connector;
@@ -140,7 +146,9 @@ public class GitHub {
         if (oauthAccessToken!=null) {
             encodedAuthorization = "token "+oauthAccessToken;
         } else {
-            if (password!=null) {
+            if(jwtToken!=null){
+                encodedAuthorization = "Bearer "+jwtToken;
+            }else if (password!=null) {
                 String authorization = (login + ':' + password);
                 String charsetName = Charsets.UTF_8.name();
                 encodedAuthorization = "Basic "+new String(Base64.encodeBase64(authorization.getBytes(charsetName)), charsetName);
@@ -154,7 +162,7 @@ public class GitHub {
         this.rateLimitHandler = rateLimitHandler;
         this.abuseLimitHandler = abuseLimitHandler;
 
-        if (login==null && encodedAuthorization!=null)
+        if (login==null && encodedAuthorization!=null && jwtToken == null)
             login = getMyself().getLogin();
         this.login = login;
     }
@@ -699,6 +707,18 @@ public GHAuthorization resetAuth(@Nonnull String clientId, @Nonnull String acces
         return retrieve().method("POST").to("/applications/" + clientId + "/tokens/" + accessToken, GHAuthorization.class);
     }
 
+    /**
+     * Returns the GitHub App associated with the authentication credentials used.
+     *
+     * You must use a JWT to access this endpoint.
+     *
+     * @see <a href="https://developer.github.com/v3/apps/#get-the-authenticated-github-app">Get the authenticated GitHub App</a>
+     */
+    @Preview @Deprecated
+    public GHApp getApp() throws IOException {
+        return retrieve().withPreview(MACHINE_MAN).to("/app", GHApp.class).wrapUp(this);
+    }
+
     /**
      * Ensures that the credential is valid.
      */
@@ -922,7 +942,11 @@ public Reader renderMarkdown(String text) throws IOException {
 
     /*package*/ static final ObjectMapper MAPPER = new ObjectMapper();
 
-    private static final String[] TIME_FORMATS = {"yyyy/MM/dd HH:mm:ss ZZZZ","yyyy-MM-dd'T'HH:mm:ss'Z'"};
+    private static final String[] TIME_FORMATS = {
+            "yyyy/MM/dd HH:mm:ss ZZZZ",
+            "yyyy-MM-dd'T'HH:mm:ss'Z'",
+            "yyyy-MM-dd'T'HH:mm:ss.S'Z'" // GitHub App endpoints return a different date format
+    };
 
     static {
         MAPPER.setVisibilityChecker(new Std(NONE, NONE, NONE, NONE, ANY));
diff --git a/src/main/java/org/kohsuke/github/GitHubBuilder.java b/src/main/java/org/kohsuke/github/GitHubBuilder.java
index d7b6e639e6..e299e7340d 100644
--- a/src/main/java/org/kohsuke/github/GitHubBuilder.java
+++ b/src/main/java/org/kohsuke/github/GitHubBuilder.java
@@ -26,7 +26,8 @@ public class GitHubBuilder implements Cloneable {
     /* private */ String user;
     /* private */ String password;
     /* private */ String oauthToken;
-    
+    /* private */ String jwtToken;
+
     private HttpConnector connector;
 
     private RateLimitHandler rateLimitHandler = RateLimitHandler.WAIT;
@@ -53,13 +54,13 @@ static GitHubBuilder fromCredentials() throws IOException {
 
         builder = fromEnvironment();
 
-        if (builder.oauthToken != null || builder.user != null)
+        if (builder.oauthToken != null || builder.user != null  || builder.jwtToken != null)
             return builder;
 
         try {
             builder = fromPropertyFile();
 
-            if (builder.oauthToken != null || builder.user != null)
+            if (builder.oauthToken != null || builder.user != null || builder.jwtToken != null)
                 return builder;
         } catch (FileNotFoundException e) {
             // fall through
@@ -108,6 +109,7 @@ public static GitHubBuilder fromEnvironment(String loginVariableName, String pas
      *     <li>GITHUB_PASSWORD: raw password
      *     <li>GITHUB_OAUTH: OAuth token to login
      *     <li>GITHUB_ENDPOINT: URL of the API endpoint
+     *     <li>GITHUB_JWT: JWT token to login
      * </ul>
      *
      * <p>
@@ -149,6 +151,7 @@ public static GitHubBuilder fromPropertyFile(String propertyFileName) throws IOE
     public static GitHubBuilder fromProperties(Properties props) {
         GitHubBuilder self = new GitHubBuilder();
         self.withOAuthToken(props.getProperty("oauth"), props.getProperty("login"));
+        self.withJwtToken(props.getProperty("jwt"));
         self.withPassword(props.getProperty("login"), props.getProperty("password"));
         self.withEndpoint(props.getProperty("endpoint", GitHub.GITHUB_URL));
         return self;
@@ -177,6 +180,10 @@ public GitHubBuilder withOAuthToken(String oauthToken, String user) {
         this.user = user;
         return this;
     }
+    public GitHubBuilder withJwtToken(String jwtToken){
+        this.jwtToken = jwtToken;
+        return this;
+    }
     public GitHubBuilder withConnector(HttpConnector connector) {
         this.connector = connector;
         return this;
@@ -204,7 +211,7 @@ public HttpURLConnection connect(URL url) throws IOException {
     }
 
     public GitHub build() throws IOException {
-        return new GitHub(endpoint, user, oauthToken, password, connector, rateLimitHandler, abuseLimitHandler);
+        return new GitHub(endpoint, user, oauthToken, jwtToken, password, connector, rateLimitHandler, abuseLimitHandler);
     }
 
     @Override
diff --git a/src/main/java/org/kohsuke/github/Previews.java b/src/main/java/org/kohsuke/github/Previews.java
index ad23bbf4c8..d99743f8e7 100644
--- a/src/main/java/org/kohsuke/github/Previews.java
+++ b/src/main/java/org/kohsuke/github/Previews.java
@@ -36,4 +36,6 @@
      * @see <a href="https://developer.github.com/v3/previews/#require-signed-commits">GitHub API Previews</a>
      */
     static final String ZZZAX = "application/vnd.github.zzzax-preview+json";
+    static final String MACHINE_MAN = "application/vnd.github.machine-man-preview+json";
+    static final String GAMBIT = "application/vnd.github.gambit-preview+json";
 }
diff --git a/src/main/java/org/kohsuke/github/Requester.java b/src/main/java/org/kohsuke/github/Requester.java
index 3c0e95ecdf..618ca87ffd 100644
--- a/src/main/java/org/kohsuke/github/Requester.java
+++ b/src/main/java/org/kohsuke/github/Requester.java
@@ -154,18 +154,14 @@ public Requester with(String key, Boolean value) {
 
     public Requester with(String key, Enum e) {
         if (e==null)    return _with(key, null);
-
-        // by convention Java constant names are upper cases, but github uses
-        // lower-case constants. GitHub also uses '-', which in Java we always
-        // replace by '_'
-        return with(key, e.toString().toLowerCase(Locale.ENGLISH).replace('_', '-'));
+        return with(key, transformEnum(e));
     }
 
     public Requester with(String key, String value) {
         return _with(key, value);
     }
 
-    public Requester with(String key, Collection<String> value) {
+    public Requester with(String key, Collection<?> value) {
         return _with(key, value);
     }
 
@@ -181,6 +177,14 @@ public Requester with(String key, Map<String, String> value) {
         return _with(key, value);
     }
 
+    public Requester withPermissions(String key, Map<String, GHPermissionType> value) {
+        Map<String,String> retMap = new HashMap<String, String>();
+        for (Map.Entry<String, GHPermissionType> entry : value.entrySet()) {
+            retMap.put(entry.getKey(), transformEnum(entry.getValue()));
+        }
+        return _with(key, retMap);
+    }
+
     public Requester with(@WillClose/*later*/ InputStream body) {
         this.body = body;
         return this;
@@ -726,6 +730,18 @@ private InputStream wrapStream(InputStream in) throws IOException {
         throw e;
     }
 
+    /**
+     * Transform Java Enum into Github constants given its conventions
+     * @param en - Enum to be transformed
+     * @return a String containing the value of a Github constant
+     */
+    private String transformEnum(Enum en){
+        // by convention Java constant names are upper cases, but github uses
+        // lower-case constants. GitHub also uses '-', which in Java we always
+        // replace by '_'
+        return en.toString().toLowerCase(Locale.ENGLISH).replace('_', '-');
+    }
+
     private static final List<String> METHODS_WITHOUT_BODY = asList("GET", "DELETE");
     private static final Logger LOGGER = Logger.getLogger(Requester.class.getName());
 }
diff --git a/src/test/java/org/kohsuke/github/GHAppTest.java b/src/test/java/org/kohsuke/github/GHAppTest.java
new file mode 100644
index 0000000000..342312ff28
--- /dev/null
+++ b/src/test/java/org/kohsuke/github/GHAppTest.java
@@ -0,0 +1,148 @@
+package org.kohsuke.github;
+
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.hamcrest.Matchers.*;
+
+/**
+ * Tests for the GitHub App API methods
+ *
+ * @author Paulo Miguel Almeida
+ */
+public class GHAppTest extends AbstractGitHubApiWireMockTest {
+
+    protected GitHubBuilder getGitHubBuilder() {
+        return super.getGitHubBuilder()
+                // ensure that only JWT will be used against the tests below
+                .withPassword(null, null)
+                .withJwtToken("bogus");
+    }
+
+    @Test
+    public void getGitHubApp() throws IOException {
+        GHApp app = gitHub.getApp();
+        assertThat(app.id, is((long) 11111));
+        assertThat(app.getOwner().id, is((long) 111111111));
+        assertThat(app.getOwner().login, is("bogus"));
+        assertThat(app.getName(), is("Bogus-Development"));
+        assertThat(app.getDescription(), is(""));
+        assertThat(app.getExternalUrl(), is("https://bogus.domain.com"));
+        assertThat(app.getHtmlUrl().toString(), is("https://github.com/apps/bogus-development"));
+        assertThat(app.getCreatedAt(), is(GitHub.parseDate("2019-06-10T04:21:41Z")));
+        assertThat(app.getUpdatedAt(), is(GitHub.parseDate("2019-06-10T04:21:41Z")));
+        assertThat(app.getPermissions().size(), is(4));
+        assertThat(app.getEvents().size(), is(2));
+        assertThat(app.getInstallationsCount(), is((long) 1));
+    }
+
+
+    @Test
+    public void listInstallations() throws IOException {
+        GHApp app = gitHub.getApp();
+        List<GHAppInstallation> installations = app.listInstallations().asList();
+        assertThat(installations.size(), is(1));
+
+        GHAppInstallation appInstallation = installations.get(0);
+        testAppInstallation(appInstallation);
+    }
+
+    @Test
+    public void getInstallationById() throws IOException {
+        GHApp app = gitHub.getApp();
+        GHAppInstallation installation = app.getInstallationById(1111111);
+        testAppInstallation(installation);
+    }
+
+    @Test
+    public void getInstallationByOrganization() throws IOException {
+        GHApp app = gitHub.getApp();
+        GHAppInstallation installation = app.getInstallationByOrganization("bogus");
+        testAppInstallation(installation);
+    }
+
+    @Test
+    public void getInstallationByRepository() throws IOException {
+        GHApp app = gitHub.getApp();
+        GHAppInstallation installation = app.getInstallationByRepository("bogus", "bogus");
+        testAppInstallation(installation);
+    }
+
+    @Test
+    public void getInstallationByUser() throws IOException {
+        GHApp app = gitHub.getApp();
+        GHAppInstallation installation = app.getInstallationByUser("bogus");
+        testAppInstallation(installation);
+    }
+
+    @Test
+    public void deleteInstallation() throws IOException {
+        GHApp app = gitHub.getApp();
+        GHAppInstallation installation = app.getInstallationByUser("bogus");
+        try {
+            installation.deleteInstallation();
+        } catch (IOException e) {
+            fail("deleteInstallation wasn't suppose to fail in this test");
+        }
+    }
+
+    @Test
+    public void createToken() throws IOException {
+        GHApp app = gitHub.getApp();
+        GHAppInstallation installation = app.getInstallationByUser("bogus");
+
+        Map<String, GHPermissionType> permissions = new HashMap<String, GHPermissionType>();
+        permissions.put("checks", GHPermissionType.WRITE);
+        permissions.put("pull_requests", GHPermissionType.WRITE);
+        permissions.put("contents", GHPermissionType.READ);
+        permissions.put("metadata", GHPermissionType.READ);
+
+        GHAppInstallationToken installationToken = installation.createToken(permissions)
+                .repositoryIds(Arrays.asList(111111111))
+                .create();
+
+        assertThat(installationToken.getToken(), is("bogus"));
+        assertThat(installation.getPermissions(), is(permissions));
+        assertThat(installationToken.getRepositorySelection(),is(GHRepositorySelection.SELECTED));
+        assertThat(installationToken.getExpiresAt(), is(GitHub.parseDate("2019-08-10T05:54:58Z")));
+
+        GHRepository repository = installationToken.getRepositories().get(0);
+        assertThat(installationToken.getRepositories().size(), is(1));
+        assertThat(repository.getId(), is((long) 111111111));
+        assertThat(repository.getName(), is("bogus"));
+    }
+
+    private void testAppInstallation(GHAppInstallation appInstallation) throws IOException {
+        Map<String, GHPermissionType> appPermissions = appInstallation.getPermissions();
+        GHUser appAccount = appInstallation.getAccount();
+
+        assertThat(appInstallation.id, is((long) 11111111));
+        assertThat(appAccount.id, is((long) 111111111));
+        assertThat(appAccount.login, is("bogus"));
+        assertThat(appInstallation.getRepositorySelection(), is(GHRepositorySelection.SELECTED));
+        assertThat(appInstallation.getAccessTokenUrl(), endsWith("/app/installations/11111111/access_tokens"));
+        assertThat(appInstallation.getRepositoriesUrl(), endsWith("/installation/repositories"));
+        assertThat(appInstallation.getAppId(), is((long) 11111));
+        assertThat(appInstallation.getTargetId(), is((long) 111111111));
+        assertThat(appInstallation.getTargetType(), is(GHTargetType.ORGANIZATION));
+
+        Map<String, GHPermissionType> permissionsMap = new HashMap<String, GHPermissionType>();
+        permissionsMap.put("checks", GHPermissionType.WRITE);
+        permissionsMap.put("pull_requests", GHPermissionType.WRITE);
+        permissionsMap.put("contents", GHPermissionType.READ);
+        permissionsMap.put("metadata", GHPermissionType.READ);
+        assertThat(appPermissions, is(permissionsMap));
+
+        List<GHEvent> events = Arrays.asList(GHEvent.PULL_REQUEST, GHEvent.PUSH);
+        assertThat(appInstallation.getEvents(), containsInAnyOrder(events.toArray(new GHEvent[0])));
+        assertThat(appInstallation.getCreatedAt(), is(GitHub.parseDate("2019-07-04T01:19:36.000Z")));
+        assertThat(appInstallation.getUpdatedAt(), is(GitHub.parseDate("2019-07-30T22:48:09.000Z")));
+        assertNull(appInstallation.getSingleFileName());
+    }
+
+}
diff --git a/src/test/java/org/kohsuke/github/GitHubTest.java b/src/test/java/org/kohsuke/github/GitHubTest.java
index 21ea40b590..35e2e14ac5 100644
--- a/src/test/java/org/kohsuke/github/GitHubTest.java
+++ b/src/test/java/org/kohsuke/github/GitHubTest.java
@@ -14,10 +14,6 @@
 
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.CoreMatchers.notNullValue;
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
 
@@ -50,7 +46,6 @@ public void testGitHubServerWithHttps() throws Exception {
         GitHub hub = GitHub.connectToEnterprise("https://enterprise.kohsuke.org/api/v3", "bogus", "bogus");
         assertEquals("https://enterprise.kohsuke.org/api/v3/test", hub.getApiURL("/test").toString());
     }
-
     @Test
     public void testGitHubServerWithoutServer() throws Exception {
         GitHub hub = GitHub.connectUsingPassword("kohsuke", "bogus");
@@ -65,6 +60,7 @@ public void testGitHubBuilderFromEnvironment() throws IOException {
         props.put("login", "bogus");
         props.put("oauth", "bogus");
         props.put("password", "bogus");
+        props.put("jwt", "bogus");
 
         setupEnvironment(props);
 
@@ -73,6 +69,7 @@ public void testGitHubBuilderFromEnvironment() throws IOException {
         assertEquals("bogus", builder.user);
         assertEquals("bogus", builder.oauthToken);
         assertEquals("bogus", builder.password);
+        assertEquals("bogus", builder.jwtToken);
 
     }
 
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-githubapp-create-installation-accesstokens.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-githubapp-create-installation-accesstokens.json
new file mode 100644
index 0000000000..d891cc0e7d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-githubapp-create-installation-accesstokens.json
@@ -0,0 +1,107 @@
+{
+  "token": "bogus",
+  "expires_at": "2019-08-10T05:54:58Z",
+  "permissions": {
+    "checks": "write",
+    "pull_requests": "write",
+    "contents": "read",
+    "metadata": "read"
+  },
+  "repository_selection": "selected",
+  "repositories": [
+    {
+      "id": 111111111,
+      "node_id": "asdfasdf",
+      "name": "bogus",
+      "full_name": "bogus/bogus",
+      "private": true,
+      "owner": {
+        "login": "bogus",
+        "id": 11111111,
+        "node_id": "asdfasdf",
+        "avatar_url": "https://avatars2.githubusercontent.com/u/11111111?v=4",
+        "gravatar_id": "",
+        "url": "https://api.github.com/users/bogus",
+        "html_url": "https://github.com/bogus",
+        "followers_url": "https://api.github.com/users/bogus/followers",
+        "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+        "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+        "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+        "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+        "organizations_url": "https://api.github.com/users/bogus/orgs",
+        "repos_url": "https://api.github.com/users/bogus/repos",
+        "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+        "received_events_url": "https://api.github.com/users/bogus/received_events",
+        "type": "Organization",
+        "site_admin": false
+      },
+      "html_url": "https://github.com/bogus/bogus",
+      "description": null,
+      "fork": false,
+      "url": "https://api.github.com/repos/bogus/bogus",
+      "forks_url": "https://api.github.com/repos/bogus/bogus/forks",
+      "keys_url": "https://api.github.com/repos/bogus/bogus/keys{/key_id}",
+      "collaborators_url": "https://api.github.com/repos/bogus/bogus/collaborators{/collaborator}",
+      "teams_url": "https://api.github.com/repos/bogus/bogus/teams",
+      "hooks_url": "https://api.github.com/repos/bogus/bogus/hooks",
+      "issue_events_url": "https://api.github.com/repos/bogus/bogus/issues/events{/number}",
+      "events_url": "https://api.github.com/repos/bogus/bogus/events",
+      "assignees_url": "https://api.github.com/repos/bogus/bogus/assignees{/user}",
+      "branches_url": "https://api.github.com/repos/bogus/bogus/branches{/branch}",
+      "tags_url": "https://api.github.com/repos/bogus/bogus/tags",
+      "blobs_url": "https://api.github.com/repos/bogus/bogus/git/blobs{/sha}",
+      "git_tags_url": "https://api.github.com/repos/bogus/bogus/git/tags{/sha}",
+      "git_refs_url": "https://api.github.com/repos/bogus/bogus/git/refs{/sha}",
+      "trees_url": "https://api.github.com/repos/bogus/bogus/git/trees{/sha}",
+      "statuses_url": "https://api.github.com/repos/bogus/bogus/statuses/{sha}",
+      "languages_url": "https://api.github.com/repos/bogus/bogus/languages",
+      "stargazers_url": "https://api.github.com/repos/bogus/bogus/stargazers",
+      "contributors_url": "https://api.github.com/repos/bogus/bogus/contributors",
+      "subscribers_url": "https://api.github.com/repos/bogus/bogus/subscribers",
+      "subscription_url": "https://api.github.com/repos/bogus/bogus/subscription",
+      "commits_url": "https://api.github.com/repos/bogus/bogus/commits{/sha}",
+      "git_commits_url": "https://api.github.com/repos/bogus/bogus/git/commits{/sha}",
+      "comments_url": "https://api.github.com/repos/bogus/bogus/comments{/number}",
+      "issue_comment_url": "https://api.github.com/repos/bogus/bogus/issues/comments{/number}",
+      "contents_url": "https://api.github.com/repos/bogus/bogus/contents/{+path}",
+      "compare_url": "https://api.github.com/repos/bogus/bogus/compare/{base}...{head}",
+      "merges_url": "https://api.github.com/repos/bogus/bogus/merges",
+      "archive_url": "https://api.github.com/repos/bogus/bogus/{archive_format}{/ref}",
+      "downloads_url": "https://api.github.com/repos/bogus/bogus/downloads",
+      "issues_url": "https://api.github.com/repos/bogus/bogus/issues{/number}",
+      "pulls_url": "https://api.github.com/repos/bogus/bogus/pulls{/number}",
+      "milestones_url": "https://api.github.com/repos/bogus/bogus/milestones{/number}",
+      "notifications_url": "https://api.github.com/repos/bogus/bogus/notifications{?since,all,participating}",
+      "labels_url": "https://api.github.com/repos/bogus/bogus/labels{/name}",
+      "releases_url": "https://api.github.com/repos/bogus/bogus/releases{/id}",
+      "deployments_url": "https://api.github.com/repos/bogus/bogus/deployments",
+      "created_at": "2018-09-06T03:25:38Z",
+      "updated_at": "2018-09-30T22:04:06Z",
+      "pushed_at": "2019-08-08T22:22:34Z",
+      "git_url": "git://github.com/bogus/bogus.git",
+      "ssh_url": "git@github.com:bogus/bogus.git",
+      "clone_url": "https://github.com/bogus/bogus.git",
+      "svn_url": "https://github.com/bogus/bogus",
+      "homepage": null,
+      "size": 618,
+      "stargazers_count": 0,
+      "watchers_count": 0,
+      "language": "Java",
+      "has_issues": true,
+      "has_projects": true,
+      "has_downloads": true,
+      "has_wiki": true,
+      "has_pages": false,
+      "forks_count": 0,
+      "mirror_url": null,
+      "archived": false,
+      "disabled": false,
+      "open_issues_count": 5,
+      "license": null,
+      "forks": 0,
+      "open_issues": 5,
+      "watchers": 0,
+      "default_branch": "master"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-mapping-githubapp-installation-by-user.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-mapping-githubapp-installation-by-user.json
new file mode 100644
index 0000000000..8975c0c55d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/__files/body-mapping-githubapp-installation-by-user.json
@@ -0,0 +1,43 @@
+{
+  "id": 11111111,
+  "account": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "repository_selection": "selected",
+  "access_tokens_url": "https://api.github.com/app/installations/11111111/access_tokens",
+  "repositories_url": "https://api.github.com/installation/repositories",
+  "html_url": "https://github.com/organizations/bogus/settings/installations/11111111",
+  "app_id": 11111,
+  "target_id": 111111111,
+  "target_type": "Organization",
+  "permissions": {
+    "checks": "write",
+    "pull_requests": "write",
+    "contents": "read",
+    "metadata": "read"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "created_at": "2019-07-04T01:19:36.000Z",
+  "updated_at": "2019-07-30T22:48:09.000Z",
+  "single_file_name": null
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-create-installation-accesstokens.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-create-installation-accesstokens.json
new file mode 100644
index 0000000000..7996662d18
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-create-installation-accesstokens.json
@@ -0,0 +1,39 @@
+{
+  "request" : {
+    "url" : "/app/installations/11111111/access_tokens",
+    "method" : "POST",
+    "bodyPatterns" : [ {
+      "equalToJson" : "{\"repository_ids\":[111111111],\"permissions\":{\"pull_requests\":\"write\",\"metadata\":\"read\",\"checks\":\"write\",\"contents\":\"read\"}}",
+      "ignoreArrayOrder" : true,
+      "ignoreExtraElements" : false
+    } ],
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response" : {
+    "status" : 201,
+    "bodyFileName" : "body-githubapp-create-installation-accesstokens.json",
+    "headers" : {
+      "Date" : "Sat, 10 Aug 2019 04:54:58 GMT",
+      "Content-Type" : "application/json; charset=utf-8",
+      "Server" : "GitHub.com",
+      "Status" : "201 Created",
+      "Cache-Control" : "public, max-age=60, s-maxage=60",
+      "Vary" : [ "Accept", "Accept-Encoding" ],
+      "ETag" : "\"c47070915d3f78d2c4aea4bd8a2c3351\"",
+      "X-GitHub-Media-Type" : "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers" : "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin" : "*",
+      "Strict-Transport-Security" : "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options" : "deny",
+      "X-Content-Type-Options" : "nosniff",
+      "X-XSS-Protection" : "1; mode=block",
+      "Referrer-Policy" : "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy" : "default-src 'none'",
+      "X-GitHub-Request-Id" : "EEC8:4357:E0DD17:110A2E7:5D4E4E22"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-installation-by-user.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-installation-by-user.json
new file mode 100644
index 0000000000..573705fde7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/createToken/mappings/mapping-githubapp-installation-by-user.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/users/bogus/installation",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-installation-by-user.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/__files/body-mapping-githubapp-installation-by-user.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/__files/body-mapping-githubapp-installation-by-user.json
new file mode 100644
index 0000000000..8975c0c55d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/__files/body-mapping-githubapp-installation-by-user.json
@@ -0,0 +1,43 @@
+{
+  "id": 11111111,
+  "account": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "repository_selection": "selected",
+  "access_tokens_url": "https://api.github.com/app/installations/11111111/access_tokens",
+  "repositories_url": "https://api.github.com/installation/repositories",
+  "html_url": "https://github.com/organizations/bogus/settings/installations/11111111",
+  "app_id": 11111,
+  "target_id": 111111111,
+  "target_type": "Organization",
+  "permissions": {
+    "checks": "write",
+    "pull_requests": "write",
+    "contents": "read",
+    "metadata": "read"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "created_at": "2019-07-04T01:19:36.000Z",
+  "updated_at": "2019-07-30T22:48:09.000Z",
+  "single_file_name": null
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-delete-installation.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-delete-installation.json
new file mode 100644
index 0000000000..4fbf043a8f
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-delete-installation.json
@@ -0,0 +1,33 @@
+{
+  "request": {
+    "url": "/app/installations/11111111",
+    "method": "DELETE",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.gambit-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 204,
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "204 No Content",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-installation-by-user.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-installation-by-user.json
new file mode 100644
index 0000000000..573705fde7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/deleteInstallation/mappings/mapping-githubapp-installation-by-user.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/users/bogus/installation",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-installation-by-user.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getGitHubApp/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getGitHubApp/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getGitHubApp/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getGitHubApp/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getGitHubApp/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getGitHubApp/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/__files/body-mapping-githubapp-installation-by-id.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/__files/body-mapping-githubapp-installation-by-id.json
new file mode 100644
index 0000000000..8975c0c55d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/__files/body-mapping-githubapp-installation-by-id.json
@@ -0,0 +1,43 @@
+{
+  "id": 11111111,
+  "account": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "repository_selection": "selected",
+  "access_tokens_url": "https://api.github.com/app/installations/11111111/access_tokens",
+  "repositories_url": "https://api.github.com/installation/repositories",
+  "html_url": "https://github.com/organizations/bogus/settings/installations/11111111",
+  "app_id": 11111,
+  "target_id": 111111111,
+  "target_type": "Organization",
+  "permissions": {
+    "checks": "write",
+    "pull_requests": "write",
+    "contents": "read",
+    "metadata": "read"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "created_at": "2019-07-04T01:19:36.000Z",
+  "updated_at": "2019-07-30T22:48:09.000Z",
+  "single_file_name": null
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/mappings/mapping-githubapp-installation-by-id.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/mappings/mapping-githubapp-installation-by-id.json
new file mode 100644
index 0000000000..87ba55f445
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationById/mappings/mapping-githubapp-installation-by-id.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app/installations/1111111",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-installation-by-id.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/__files/body-mapping-githubapp-installation-by-organization.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/__files/body-mapping-githubapp-installation-by-organization.json
new file mode 100644
index 0000000000..8975c0c55d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/__files/body-mapping-githubapp-installation-by-organization.json
@@ -0,0 +1,43 @@
+{
+  "id": 11111111,
+  "account": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "repository_selection": "selected",
+  "access_tokens_url": "https://api.github.com/app/installations/11111111/access_tokens",
+  "repositories_url": "https://api.github.com/installation/repositories",
+  "html_url": "https://github.com/organizations/bogus/settings/installations/11111111",
+  "app_id": 11111,
+  "target_id": 111111111,
+  "target_type": "Organization",
+  "permissions": {
+    "checks": "write",
+    "pull_requests": "write",
+    "contents": "read",
+    "metadata": "read"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "created_at": "2019-07-04T01:19:36.000Z",
+  "updated_at": "2019-07-30T22:48:09.000Z",
+  "single_file_name": null
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/mappings/mapping-githubapp-installation-by-organization.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/mappings/mapping-githubapp-installation-by-organization.json
new file mode 100644
index 0000000000..bd94ed4800
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByOrganization/mappings/mapping-githubapp-installation-by-organization.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/orgs/bogus/installation",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-installation-by-organization.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/__files/body-mapping-githubapp-installation-by-repository.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/__files/body-mapping-githubapp-installation-by-repository.json
new file mode 100644
index 0000000000..8975c0c55d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/__files/body-mapping-githubapp-installation-by-repository.json
@@ -0,0 +1,43 @@
+{
+  "id": 11111111,
+  "account": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "repository_selection": "selected",
+  "access_tokens_url": "https://api.github.com/app/installations/11111111/access_tokens",
+  "repositories_url": "https://api.github.com/installation/repositories",
+  "html_url": "https://github.com/organizations/bogus/settings/installations/11111111",
+  "app_id": 11111,
+  "target_id": 111111111,
+  "target_type": "Organization",
+  "permissions": {
+    "checks": "write",
+    "pull_requests": "write",
+    "contents": "read",
+    "metadata": "read"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "created_at": "2019-07-04T01:19:36.000Z",
+  "updated_at": "2019-07-30T22:48:09.000Z",
+  "single_file_name": null
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/mappings/mapping-githubapp-installation-by-repository.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/mappings/mapping-githubapp-installation-by-repository.json
new file mode 100644
index 0000000000..3fd3c011c0
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByRepository/mappings/mapping-githubapp-installation-by-repository.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/repos/bogus/bogus/installation",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-installation-by-repository.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/__files/body-mapping-githubapp-installation-by-user.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/__files/body-mapping-githubapp-installation-by-user.json
new file mode 100644
index 0000000000..8975c0c55d
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/__files/body-mapping-githubapp-installation-by-user.json
@@ -0,0 +1,43 @@
+{
+  "id": 11111111,
+  "account": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "repository_selection": "selected",
+  "access_tokens_url": "https://api.github.com/app/installations/11111111/access_tokens",
+  "repositories_url": "https://api.github.com/installation/repositories",
+  "html_url": "https://github.com/organizations/bogus/settings/installations/11111111",
+  "app_id": 11111,
+  "target_id": 111111111,
+  "target_type": "Organization",
+  "permissions": {
+    "checks": "write",
+    "pull_requests": "write",
+    "contents": "read",
+    "metadata": "read"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "created_at": "2019-07-04T01:19:36.000Z",
+  "updated_at": "2019-07-30T22:48:09.000Z",
+  "single_file_name": null
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/mappings/mapping-githubapp-installation-by-user.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/mappings/mapping-githubapp-installation-by-user.json
new file mode 100644
index 0000000000..573705fde7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/getInstallationByUser/mappings/mapping-githubapp-installation-by-user.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/users/bogus/installation",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-installation-by-user.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/__files/body-mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/__files/body-mapping-githubapp-app.json
new file mode 100644
index 0000000000..d36be086d7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/__files/body-mapping-githubapp-app.json
@@ -0,0 +1,41 @@
+{
+  "id": 11111,
+  "node_id": "MDM6QXBwMzI2MTY=",
+  "owner": {
+    "login": "bogus",
+    "id": 111111111,
+    "node_id": "asdfasdfasdf",
+    "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bogus",
+    "html_url": "https://github.com/bogus",
+    "followers_url": "https://api.github.com/users/bogus/followers",
+    "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+    "organizations_url": "https://api.github.com/users/bogus/orgs",
+    "repos_url": "https://api.github.com/users/bogus/repos",
+    "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bogus/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "name": "Bogus-Development",
+  "description": "",
+  "external_url": "https://bogus.domain.com",
+  "html_url": "https://github.com/apps/bogus-development",
+  "created_at": "2019-06-10T04:21:41Z",
+  "updated_at": "2019-06-10T04:21:41Z",
+  "permissions": {
+    "checks": "write",
+    "contents": "read",
+    "metadata": "read",
+    "pull_requests": "write"
+  },
+  "events": [
+    "pull_request",
+    "push"
+  ],
+  "installations_count": 1
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/__files/body-mapping-githubapp-installations.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/__files/body-mapping-githubapp-installations.json
new file mode 100644
index 0000000000..d81bc3786e
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/__files/body-mapping-githubapp-installations.json
@@ -0,0 +1,45 @@
+[
+  {
+  "id": 11111111,
+    "account": {
+      "login": "bogus",
+      "id": 111111111,
+      "node_id": "asdfasdfasdf",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/111111111?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/bogus",
+      "html_url": "https://github.com/bogus",
+      "followers_url": "https://api.github.com/users/bogus/followers",
+      "following_url": "https://api.github.com/users/bogus/following{/other_user}",
+      "gists_url": "https://api.github.com/users/bogus/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/bogus/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/bogus/subscriptions",
+      "organizations_url": "https://api.github.com/users/bogus/orgs",
+      "repos_url": "https://api.github.com/users/bogus/repos",
+      "events_url": "https://api.github.com/users/bogus/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/bogus/received_events",
+      "type": "Organization",
+      "site_admin": false
+    },
+    "repository_selection": "selected",
+    "access_tokens_url": "https://api.github.com/app/installations/11111111/access_tokens",
+    "repositories_url": "https://api.github.com/installation/repositories",
+    "html_url": "https://github.com/organizations/bogus/settings/installations/11111111",
+    "app_id": 11111,
+    "target_id": 111111111,
+    "target_type": "Organization",
+    "permissions": {
+      "checks": "write",
+      "pull_requests": "write",
+      "contents": "read",
+      "metadata": "read"
+    },
+    "events": [
+      "pull_request",
+      "push"
+    ],
+    "created_at": "2019-07-04T01:19:36.000Z",
+    "updated_at": "2019-07-30T22:48:09.000Z",
+    "single_file_name": null
+  }
+]
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/mappings/mapping-githubapp-app.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/mappings/mapping-githubapp-app.json
new file mode 100644
index 0000000000..999f4c8286
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/mappings/mapping-githubapp-app.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-app.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/mappings/mapping-githubapp-installations.json b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/mappings/mapping-githubapp-installations.json
new file mode 100644
index 0000000000..5b01455c26
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHAppTest/wiremock/listInstallations/mappings/mapping-githubapp-installations.json
@@ -0,0 +1,34 @@
+{
+  "request": {
+    "url": "/app/installations",
+    "method": "GET",
+    "headers" : {
+      "Accept" : {
+        "equalTo" : "application/vnd.github.machine-man-preview+json"
+      }
+    }
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "body-mapping-githubapp-installations.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Fri, 09 Aug 2019 05:36:38 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "Cache-Control": "public, max-age=60, s-maxage=60",
+      "Vary": ["Accept","Accept-Encoding"],
+      "ETag": "W/\"01163b1a237898d328ed56cd0e9aefca\"",
+      "X-GitHub-Media-Type": "github.machine-man-preview; format=json",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Content-Type-Options": "nosniff",
+      "X-Frame-Options": "deny",
+      "X-XSS-Protection": "1; mode=block",
+      "X-GitHub-Request-Id": "E0C4:3088:300C54:3ACB77:5D4D0666"
+    }
+  }
+}
\ No newline at end of file