diff --git a/connectors/http-json/README.md b/connectors/http-json/README.md
index 0b2f634ebb..846fbe979b 100644
--- a/connectors/http-json/README.md
+++ b/connectors/http-json/README.md
@@ -106,6 +106,34 @@ The response will contain the status code, the headers and the body of the respo
 }
 ```
 
+### Input (OAuth)
+
+```json
+{
+  "method": "post",
+  "url": "https://youroauthclientdomainname.eu.auth0.com/oauth/token",
+  "authentication": {
+    "oauthTokenEndpoint":"secrets.OAUTH_TOKEN_ENDPOINT_KEY",
+    "scopes": "read:clients read:users",
+    "audience":"secrets.AUDIENCE_KEY",
+    "clientId":"secrets.CLIENT_ID_KEY",
+    "clientSecret":"secrets.CLIENT_SECRET_KEY",
+    "type": "oauth-client-credentials-flow",
+    "clientAuthentication":"secrets.CLIENT_AUTHENTICATION_KEY"
+  }
+}
+```
+
+### Output (Access Token)
+
+```json
+{
+  "access_token":"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IlUtN2N6WG1sMzljUFNfUnlQQkNMWCJ9.kjhwfjkhfejkrhfbwjkfbhetcetc",
+  "scope":"read:clients create:users",
+  "expires_in":86400,
+  "token_type":"Bearer"
+}
+```
 ### Error codes
 
 The Connector will fail on any non-2XX HTTP status code in the response. This error status code will be passed on as error code, e.g. "404".
diff --git a/connectors/http-json/element-templates/http-json-connector.json b/connectors/http-json/element-templates/http-json-connector.json
index 36543fdc15..578e8d44d2 100644
--- a/connectors/http-json/element-templates/http-json-connector.json
+++ b/connectors/http-json/element-templates/http-json-connector.json
@@ -251,9 +251,6 @@
         "type": "zeebe:input",
         "name": "authentication.audience"
       },
-      "constraints": {
-        "notEmpty": true
-      },
       "condition": {
         "property": "authenticationType",
         "equals": "oauth-client-credentials-flow"
diff --git a/connectors/http-json/pom.xml b/connectors/http-json/pom.xml
index ba0bc7235c..4173032448 100644
--- a/connectors/http-json/pom.xml
+++ b/connectors/http-json/pom.xml
@@ -186,7 +186,7 @@
                 <dependency>
                     <groupId>io.camunda.connector</groupId>
                     <artifactId>connector-runtime-cloud</artifactId>
-                    <version>0.4.0-SNAPSHOT</version>
+                    <version>0.3.0</version>
                 </dependency>
                 <dependency>
                     <groupId>io.camunda.connector</groupId>
diff --git a/connectors/http-json/src/main/java/io/camunda/connector/http/HttpJsonFunction.java b/connectors/http-json/src/main/java/io/camunda/connector/http/HttpJsonFunction.java
index 183df23ac6..a2a6fbceef 100644
--- a/connectors/http-json/src/main/java/io/camunda/connector/http/HttpJsonFunction.java
+++ b/connectors/http-json/src/main/java/io/camunda/connector/http/HttpJsonFunction.java
@@ -26,7 +26,7 @@
 import com.google.api.client.http.HttpRequestFactory;
 import com.google.api.client.http.HttpResponse;
 import com.google.api.client.http.HttpResponseException;
-import com.google.api.client.http.json.JsonHttpContent;
+import com.google.api.client.http.UrlEncodedContent;
 import com.google.api.client.json.gson.GsonFactory;
 import com.google.gson.Gson;
 import com.google.gson.JsonObject;
@@ -147,19 +147,19 @@ protected HttpRequest createOAuthRequest(HttpJsonRequest request) throws IOExcep
 
     final GenericUrl genericUrl = new GenericUrl(authentication.getOauthTokenEndpoint());
     Map<String, String> data = getDataForAuthRequestBody(authentication);
-    HttpContent content = new JsonHttpContent(gsonFactory, data);
+    HttpContent content = new UrlEncodedContent(data);
     final String method = Constants.POST;
-
     final var httpRequest = requestFactory.buildRequest(method, genericUrl, content);
     httpRequest.setFollowRedirects(false);
     setTimeout(request, httpRequest);
+    HttpHeaders headers = new HttpHeaders();
 
     if (authentication.getClientAuthentication().equals(Constants.BASIC_AUTH_HEADER)) {
-      HttpHeaders headers = new HttpHeaders();
       headers.setBasicAuthentication(
           authentication.getClientId(), authentication.getClientSecret());
-      httpRequest.setHeaders(headers);
     }
+    headers.setContentType(Constants.APPLICATION_X_WWW_FORM_URLENCODED);
+    httpRequest.setHeaders(headers);
     return httpRequest;
   }
 
@@ -202,7 +202,7 @@ protected HttpJsonResult executeRequestViaProxy(String proxyUrl, HttpJsonRequest
     // hence write it ourselves:
     String contentAsJson = gson.toJson(request);
     HttpContent content =
-        new AbstractHttpContent("application/json; charset=UTF-8") {
+        new AbstractHttpContent(Constants.APPLICATION_JSON_CHARSET_UTF_8) {
           public void writeTo(OutputStream outputStream) throws IOException {
             outputStream.write(contentAsJson.getBytes(StandardCharsets.UTF_8));
           }
@@ -258,7 +258,7 @@ protected void setTimeout(HttpJsonRequest request, HttpRequest httpRequest) {
 
   protected HttpContent createContent(final HttpJsonRequest request) {
     if (request.hasBody()) {
-      return new JsonHttpContent(gsonFactory, request.getBody());
+      return new UrlEncodedContent(request.hasBody());
     } else {
       return null;
     }
diff --git a/connectors/http-json/src/main/java/io/camunda/connector/http/constants/Constants.java b/connectors/http-json/src/main/java/io/camunda/connector/http/constants/Constants.java
index 0b0e089b6a..0f29108410 100644
--- a/connectors/http-json/src/main/java/io/camunda/connector/http/constants/Constants.java
+++ b/connectors/http-json/src/main/java/io/camunda/connector/http/constants/Constants.java
@@ -28,4 +28,7 @@ public class Constants {
   public static final String CREDENTIALS_BODY = "credentialsBody";
   public static final String PROXY_FUNCTION_URL_ENV_NAME = "CAMUNDA_CONNECTOR_HTTP_PROXY_URL";
   public static final String POST = "POST";
+  public static final String APPLICATION_JSON_CHARSET_UTF_8 = "application/json; charset=UTF-8";
+  public static final String APPLICATION_X_WWW_FORM_URLENCODED =
+      "application/x-www-form-urlencoded";
 }