diff --git a/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java b/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java
index e43e2427bd5..95305eeceef 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/SampleCodeHelperComposer.java
@@ -31,6 +31,7 @@
 import com.google.api.generator.gapic.model.ResourceName;
 import com.google.api.generator.gapic.utils.JavaStyle;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
@@ -47,7 +48,7 @@ public static TryCatchStatement composeRpcMethodSampleCode(
       Map<String, ResourceName> resourceNames) {
     // Default Unary RPC method.
     if (arguments.isEmpty()) {
-      return composeUnaryRpcDefaultMethodSampleCode(method, clientType);
+      return composeUnaryRpcDefaultMethodSampleCode(method, clientType, resourceNames);
     }
     // Paged Unary RPC method.
     if (method.isPaged()) {
@@ -174,18 +175,78 @@ private static TryCatchStatement composePagedUnaryRpcMethodSampleCode(
   }
 
   private static TryCatchStatement composeUnaryRpcDefaultMethodSampleCode(
-      Method method, TypeNode clientType) {
+      Method method, TypeNode clientType, Map<String, ResourceName> resourceNames) {
     // TODO(summerji): compose sample code for unary default rpc method.
     // TODO(summerji): Add unit tests.
-    String content =
-        String.format(
-            "Note: Not Implement yet, placeholder for unary %s rpc method sample code.",
-            (!method.hasLro() && !method.isPaged()
-                ? "default"
-                : (method.hasLro() ? "lro default" : "paged default")));
+    // If variant method signatures exists, use the first one.
+    List<MethodArgument> arguments =
+        !method.methodSignatures().isEmpty()
+            ? method.methodSignatures().get(0)
+            : Collections.emptyList();
+    // Assign each method arguments with default value.
+    List<Statement> bodyStatements =
+        arguments.stream()
+            .map(
+                methodArg ->
+                    ExprStatement.withExpr(
+                        assignMethodArgumentWithDefaultValue(methodArg, resourceNames)))
+            .collect(Collectors.toList());
+    // Assign request variables with set argument attributes.
+    // e.g EchoRequest
+    bodyStatements.add(
+        ExprStatement.withExpr(createRequestBuilderExpr(method.inputType(), arguments)));
+
+    if (method.isPaged()) {
+      // For loop on invoke client method's iterator with comment.
+      // e.g. for (EchoClient echoClient : echoClient.PagedExpand(request).iterateAll()) {//..}
+      bodyStatements.add(
+          ForStatement.builder()
+              .setLocalVariableExpr(createVariableDeclExpr(getClientName(clientType), clientType))
+              .setCollectionExpr(createIteratorAllMethodExpr(method, clientType, arguments))
+              .setBody(Arrays.asList(createLineCommentStatement("doThingsWith(element);")))
+              .build());
+    } else if (method.hasLro()) {
+      // Create response variable by invoke client's async method.
+      // e.g Operation response = EchoClient.waitAsync(request).get();
+      Expr getResponseMethodExpr =
+          MethodInvocationExpr.builder()
+              .setExprReferenceExpr(
+                  MethodInvocationExpr.builder()
+                      .setStaticReferenceType(clientType)
+                      .setMethodName(getLroMethodName(method.name()))
+                      .setArguments(
+                          Arrays.asList(createVariableExpr(REQUEST_VAR_NAME, method.inputType())))
+                      .build())
+              .setMethodName("get")
+              .setReturnType(method.outputType())
+              .build();
+      bodyStatements.add(
+          ExprStatement.withExpr(
+              AssignmentExpr.builder()
+                  .setVariableExpr(createVariableDeclExpr(RESPONSE_VAR_NAME, method.outputType()))
+                  .setValueExpr(getResponseMethodExpr)
+                  .build()));
+    } else {
+      // Create response variable by invoke client's method by passing request.
+      // e.g. EchoResponse response = echoClient.Echo(request);
+      Expr invokeMethodExpr =
+          MethodInvocationExpr.builder()
+              .setExprReferenceExpr(createVariableExpr(getClientName(clientType), clientType))
+              .setMethodName(method.name())
+              .setArguments(createVariableExpr("request", method.inputType()))
+              .setReturnType(method.outputType())
+              .build();
+      bodyStatements.add(
+          ExprStatement.withExpr(
+              AssignmentExpr.builder()
+                  .setVariableExpr(createVariableDeclExpr(RESPONSE_VAR_NAME, method.outputType()))
+                  .setValueExpr(invokeMethodExpr)
+                  .build()));
+    }
+
     return TryCatchStatement.builder()
         .setTryResourceExpr(assignClientVariableWithCreateMethodExpr(clientType))
-        .setTryBody(Arrays.asList(createLineCommentStatement(content)))
+        .setTryBody(bodyStatements)
         .setIsSampleCode(true)
         .build();
   }
@@ -206,6 +267,37 @@ private static AssignmentExpr assignClientVariableWithCreateMethodExpr(TypeNode
         .build();
   }
 
+  // Create request variable by set attributes.
+  // e.g. EchoRequest request = EchoRequest.newBuilder().setParent(parent).build();
+  private static Expr createRequestBuilderExpr(
+      TypeNode requestType, List<MethodArgument> arguments) {
+    MethodInvocationExpr newBuilderExpr =
+        MethodInvocationExpr.builder()
+            .setStaticReferenceType(requestType)
+            .setMethodName("newBuilder")
+            .build();
+    for (MethodArgument arg : arguments) {
+      newBuilderExpr =
+          MethodInvocationExpr.builder()
+              .setExprReferenceExpr(newBuilderExpr)
+              .setMethodName(String.format("set%s", JavaStyle.toUpperCamelCase(arg.name())))
+              .setArguments(
+                  VariableExpr.withVariable(
+                      Variable.builder().setName(arg.name()).setType(arg.type()).build()))
+              .build();
+    }
+    MethodInvocationExpr requestBuildExpr =
+        MethodInvocationExpr.builder()
+            .setExprReferenceExpr(newBuilderExpr)
+            .setMethodName("build")
+            .setReturnType(requestType)
+            .build();
+    return AssignmentExpr.builder()
+        .setVariableExpr(createVariableDeclExpr("request", requestType))
+        .setValueExpr(requestBuildExpr)
+        .build();
+  }
+
   private static Expr assignMethodArgumentWithDefaultValue(
       MethodArgument argument, Map<String, ResourceName> resourceNames) {
     return AssignmentExpr.builder()
diff --git a/src/main/java/com/google/api/generator/gapic/composer/ServiceClientSampleCodeComposer.java b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientSampleCodeComposer.java
index 887f6f6cef4..2bcd6812357 100644
--- a/src/main/java/com/google/api/generator/gapic/composer/ServiceClientSampleCodeComposer.java
+++ b/src/main/java/com/google/api/generator/gapic/composer/ServiceClientSampleCodeComposer.java
@@ -40,6 +40,7 @@
 
 public class ServiceClientSampleCodeComposer {
   // TODO(summerji): Add unit tests for ServiceClientSampleCodeComposer.
+  // TODO(summerji): Refactor signatures as sample code context.
 
   public static String composeClassHeaderCredentialsSampleCode(
       TypeNode clientType, TypeNode settingsType) {
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
index dc556ad007f..077c35e1567 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/EchoClient.golden
@@ -287,7 +287,9 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   ResourceName parent = FoobarName.ofProjectFoobarName("[PROJECT]", "[FOOBAR]");
+   *   EchoRequest request = EchoRequest.newBuilder().setParent(parent).build();
+   *   EchoResponse response = echoClient.Echo(request);
    * }
    * }</pre>
    *
@@ -334,7 +336,10 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   PagedExpandRequest request = PagedExpandRequest.newBuilder().build();
+   *   for (EchoClient echoClient : echoClient.PagedExpand(request).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -402,7 +407,9 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   Duration ttl = Duration.newBuilder().build();
+   *   WaitRequest request = WaitRequest.newBuilder().setTtl(ttl).build();
+   *   Operation response = EchoClient.waitAsync(request).get();
    * }
    * }</pre>
    *
@@ -431,7 +438,8 @@ public class EchoClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (EchoClient echoClient = EchoClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   BlockRequest request = BlockRequest.newBuilder().build();
+   *   BlockResponse response = echoClient.Block(request);
    * }
    * }</pre>
    *
diff --git a/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden b/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
index 55dfb989f9a..9cea5ba67a8 100644
--- a/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
+++ b/src/test/java/com/google/api/generator/gapic/composer/goldens/IdentityClient.golden
@@ -204,7 +204,16 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   String display_name = "display_name1615086568";
+   *   String email = "email96619420";
+   *   CreateUserRequest request =
+   *       CreateUserRequest.newBuilder()
+   *           .setParent(parent)
+   *           .setDisplayName(display_name)
+   *           .setEmail(email)
+   *           .build();
+   *   User response = identityClient.CreateUser(request);
    * }
    * }</pre>
    *
@@ -266,7 +275,9 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   UserName name = UserName.of("[USER]");
+   *   GetUserRequest request = GetUserRequest.newBuilder().setName(name).build();
+   *   User response = identityClient.GetUser(request);
    * }
    * }</pre>
    *
@@ -289,7 +300,8 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   UpdateUserRequest request = UpdateUserRequest.newBuilder().build();
+   *   User response = identityClient.UpdateUser(request);
    * }
    * }</pre>
    *
@@ -353,7 +365,9 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   UserName name = UserName.of("[USER]");
+   *   DeleteUserRequest request = DeleteUserRequest.newBuilder().setName(name).build();
+   *   Empty response = identityClient.DeleteUser(request);
    * }
    * }</pre>
    *
@@ -376,7 +390,10 @@ public class IdentityClient implements BackgroundResource {
    *
    * <pre>{@code
    * try (IdentityClient identityClient = IdentityClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   ListUsersRequest request = ListUsersRequest.newBuilder().build();
+   *   for (IdentityClient identityClient : identityClient.ListUsers(request).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/asset/AssetServiceClient.java b/test/integration/goldens/asset/AssetServiceClient.java
index 2e0e5f68726..cfa2f86cfc4 100644
--- a/test/integration/goldens/asset/AssetServiceClient.java
+++ b/test/integration/goldens/asset/AssetServiceClient.java
@@ -170,7 +170,8 @@ public final OperationsClient getOperationsClient() {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   ExportAssetsRequest request = ExportAssetsRequest.newBuilder().build();
+   *   Operation response = AssetServiceClient.exportAssetsAsync(request).get();
    * }
    * }</pre>
    *
@@ -229,7 +230,8 @@ public final UnaryCallable<ExportAssetsRequest, Operation> exportAssetsCallable(
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   BatchGetAssetsHistoryRequest request = BatchGetAssetsHistoryRequest.newBuilder().build();
+   *   BatchGetAssetsHistoryResponse response = assetServiceClient.BatchGetAssetsHistory(request);
    * }
    * }</pre>
    *
@@ -288,7 +290,9 @@ public final Feed createFeed(String parent) {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   CreateFeedRequest request = CreateFeedRequest.newBuilder().setParent(parent).build();
+   *   Feed response = assetServiceClient.CreateFeed(request);
    * }
    * }</pre>
    *
@@ -364,7 +368,9 @@ public final Feed getFeed(String name) {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   FeedName name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]");
+   *   GetFeedRequest request = GetFeedRequest.newBuilder().setName(name).build();
+   *   Feed response = assetServiceClient.GetFeed(request);
    * }
    * }</pre>
    *
@@ -416,7 +422,9 @@ public final ListFeedsResponse listFeeds(String parent) {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   String parent = "parent-995424086";
+   *   ListFeedsRequest request = ListFeedsRequest.newBuilder().setParent(parent).build();
+   *   ListFeedsResponse response = assetServiceClient.ListFeeds(request);
    * }
    * }</pre>
    *
@@ -468,7 +476,9 @@ public final Feed updateFeed(Feed feed) {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   Feed feed = Feed.newBuilder().build();
+   *   UpdateFeedRequest request = UpdateFeedRequest.newBuilder().setFeed(feed).build();
+   *   Feed response = assetServiceClient.UpdateFeed(request);
    * }
    * }</pre>
    *
@@ -546,7 +556,9 @@ public final Empty deleteFeed(String name) {
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   FeedName name = FeedName.ofProjectFeedName("[PROJECT]", "[FEED]");
+   *   DeleteFeedRequest request = DeleteFeedRequest.newBuilder().setName(name).build();
+   *   Empty response = assetServiceClient.DeleteFeed(request);
    * }
    * }</pre>
    *
@@ -657,7 +669,19 @@ public final SearchAllResourcesPagedResponse searchAllResources(
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   String scope = "scope109264468";
+   *   String query = "query107944136";
+   *   List<String> asset_types = new ArrayList<>();
+   *   SearchAllResourcesRequest request =
+   *       SearchAllResourcesRequest.newBuilder()
+   *           .setScope(scope)
+   *           .setQuery(query)
+   *           .setAssetTypes(asset_types)
+   *           .build();
+   *   for (AssetServiceClient assetServiceClient :
+   *       assetServiceClient.SearchAllResources(scope, query, asset_types).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -768,7 +792,14 @@ public final SearchAllIamPoliciesPagedResponse searchAllIamPolicies(String scope
    *
    * <pre>{@code
    * try (AssetServiceClient assetServiceClient = AssetServiceClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   String scope = "scope109264468";
+   *   String query = "query107944136";
+   *   SearchAllIamPoliciesRequest request =
+   *       SearchAllIamPoliciesRequest.newBuilder().setScope(scope).setQuery(query).build();
+   *   for (AssetServiceClient assetServiceClient :
+   *       assetServiceClient.SearchAllIamPolicies(scope, query).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/logging/ConfigServiceV2Client.java b/test/integration/goldens/logging/ConfigServiceV2Client.java
index 80338abe61f..2042747d895 100644
--- a/test/integration/goldens/logging/ConfigServiceV2Client.java
+++ b/test/integration/goldens/logging/ConfigServiceV2Client.java
@@ -316,7 +316,13 @@ public final ListBucketsPagedResponse listBuckets(String parent) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   BillingAccountLocationName parent =
+   *       BillingAccountLocationName.of("[BILLING_ACCOUNT]", "[LOCATION]");
+   *   ListBucketsRequest request = ListBucketsRequest.newBuilder().setParent(parent).build();
+   *   for (ConfigServiceV2Client configServiceV2Client :
+   *       configServiceV2Client.ListBuckets(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -356,7 +362,8 @@ public final UnaryCallable<ListBucketsRequest, ListBucketsResponse> listBucketsC
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   GetBucketRequest request = GetBucketRequest.newBuilder().build();
+   *   LogBucket response = configServiceV2Client.GetBucket(request);
    * }
    * }</pre>
    *
@@ -394,7 +401,8 @@ public final UnaryCallable<GetBucketRequest, LogBucket> getBucketCallable() {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   UpdateBucketRequest request = UpdateBucketRequest.newBuilder().build();
+   *   LogBucket response = configServiceV2Client.UpdateBucket(request);
    * }
    * }</pre>
    *
@@ -574,7 +582,12 @@ public final ListSinksPagedResponse listSinks(String parent) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
+   *   ListSinksRequest request = ListSinksRequest.newBuilder().setParent(parent).build();
+   *   for (ConfigServiceV2Client configServiceV2Client :
+   *       configServiceV2Client.ListSinks(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -668,7 +681,9 @@ public final LogSink getSink(String sinkName) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogSinkName sink_name = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
+   *   GetSinkRequest request = GetSinkRequest.newBuilder().setSinkName(sink_name).build();
+   *   LogSink response = configServiceV2Client.GetSink(request);
    * }
    * }</pre>
    *
@@ -867,7 +882,11 @@ public final LogSink createSink(String parent, LogSink sink) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   CreateSinkRequest request =
+   *       CreateSinkRequest.newBuilder().setParent(parent).setSink(sink).build();
+   *   LogSink response = configServiceV2Client.CreateSink(request);
    * }
    * }</pre>
    *
@@ -1074,7 +1093,11 @@ public final LogSink updateSink(String sinkName, LogSink sink, FieldMask updateM
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogSinkName sink_name = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
+   *   LogSink sink = LogSink.newBuilder().build();
+   *   UpdateSinkRequest request =
+   *       UpdateSinkRequest.newBuilder().setSinkName(sink_name).setSink(sink).build();
+   *   LogSink response = configServiceV2Client.UpdateSink(request);
    * }
    * }</pre>
    *
@@ -1167,7 +1190,9 @@ public final Empty deleteSink(String sinkName) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogSinkName sink_name = LogSinkName.ofProjectSinkName("[PROJECT]", "[SINK]");
+   *   DeleteSinkRequest request = DeleteSinkRequest.newBuilder().setSinkName(sink_name).build();
+   *   Empty response = configServiceV2Client.DeleteSink(request);
    * }
    * }</pre>
    *
@@ -1339,7 +1364,12 @@ public final ListExclusionsPagedResponse listExclusions(String parent) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
+   *   ListExclusionsRequest request = ListExclusionsRequest.newBuilder().setParent(parent).build();
+   *   for (ConfigServiceV2Client configServiceV2Client :
+   *       configServiceV2Client.ListExclusions(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -1435,7 +1465,9 @@ public final LogExclusion getExclusion(String name) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
+   *   GetExclusionRequest request = GetExclusionRequest.newBuilder().setName(name).build();
+   *   LogExclusion response = configServiceV2Client.GetExclusion(request);
    * }
    * }</pre>
    *
@@ -1622,7 +1654,11 @@ public final LogExclusion createExclusion(String parent, LogExclusion exclusion)
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   CreateExclusionRequest request =
+   *       CreateExclusionRequest.newBuilder().setParent(parent).setExclusion(exclusion).build();
+   *   LogExclusion response = configServiceV2Client.CreateExclusion(request);
    * }
    * }</pre>
    *
@@ -1736,7 +1772,16 @@ public final LogExclusion updateExclusion(
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
+   *   LogExclusion exclusion = LogExclusion.newBuilder().build();
+   *   FieldMask update_mask = FieldMask.newBuilder().build();
+   *   UpdateExclusionRequest request =
+   *       UpdateExclusionRequest.newBuilder()
+   *           .setName(name)
+   *           .setExclusion(exclusion)
+   *           .setUpdateMask(update_mask)
+   *           .build();
+   *   LogExclusion response = configServiceV2Client.UpdateExclusion(request);
    * }
    * }</pre>
    *
@@ -1820,7 +1865,9 @@ public final Empty deleteExclusion(String name) {
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogExclusionName name = LogExclusionName.ofProjectExclusionName("[PROJECT]", "[EXCLUSION]");
+   *   DeleteExclusionRequest request = DeleteExclusionRequest.newBuilder().setName(name).build();
+   *   Empty response = configServiceV2Client.DeleteExclusion(request);
    * }
    * }</pre>
    *
@@ -1855,7 +1902,8 @@ public final UnaryCallable<DeleteExclusionRequest, Empty> deleteExclusionCallabl
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   GetCmekSettingsRequest request = GetCmekSettingsRequest.newBuilder().build();
+   *   CmekSettings response = configServiceV2Client.GetCmekSettings(request);
    * }
    * }</pre>
    *
@@ -1901,7 +1949,8 @@ public final UnaryCallable<GetCmekSettingsRequest, CmekSettings> getCmekSettings
    *
    * <pre>{@code
    * try (ConfigServiceV2Client configServiceV2Client = ConfigServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   UpdateCmekSettingsRequest request = UpdateCmekSettingsRequest.newBuilder().build();
+   *   CmekSettings response = configServiceV2Client.UpdateCmekSettings(request);
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/logging/LoggingServiceV2Client.java b/test/integration/goldens/logging/LoggingServiceV2Client.java
index 3ef9ab541a6..efd1503cece 100644
--- a/test/integration/goldens/logging/LoggingServiceV2Client.java
+++ b/test/integration/goldens/logging/LoggingServiceV2Client.java
@@ -216,7 +216,9 @@ public final Empty deleteLog(String logName) {
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogName log_name = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
+   *   DeleteLogRequest request = DeleteLogRequest.newBuilder().setLogName(log_name).build();
+   *   Empty response = loggingServiceV2Client.DeleteLog(request);
    * }
    * }</pre>
    *
@@ -400,7 +402,18 @@ public final WriteLogEntriesResponse writeLogEntries(
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogName log_name = LogName.ofProjectLogName("[PROJECT]", "[LOG]");
+   *   MonitoredResource resource = MonitoredResource.newBuilder().build();
+   *   Map<String, String> labels = new HashMap<>();
+   *   List<LogEntry> entries = new ArrayList<>();
+   *   WriteLogEntriesRequest request =
+   *       WriteLogEntriesRequest.newBuilder()
+   *           .setLogName(log_name)
+   *           .setResource(resource)
+   *           .setLabels(labels)
+   *           .setEntries(entries)
+   *           .build();
+   *   WriteLogEntriesResponse response = loggingServiceV2Client.WriteLogEntries(request);
    * }
    * }</pre>
    *
@@ -484,7 +497,19 @@ public final ListLogEntriesPagedResponse listLogEntries(
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   List<String> resource_names = new ArrayList<>();
+   *   String filter = "filter-1274492040";
+   *   String order_by = "order_by1234304744";
+   *   ListLogEntriesRequest request =
+   *       ListLogEntriesRequest.newBuilder()
+   *           .setResourceNames(resource_names)
+   *           .setFilter(filter)
+   *           .setOrderBy(order_by)
+   *           .build();
+   *   for (LoggingServiceV2Client loggingServiceV2Client :
+   *       loggingServiceV2Client.ListLogEntries(resource_names, filter, order_by).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -529,7 +554,12 @@ public final ListLogEntriesPagedResponse listLogEntries(ListLogEntriesRequest re
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   ListMonitoredResourceDescriptorsRequest request =
+   *       ListMonitoredResourceDescriptorsRequest.newBuilder().build();
+   *   for (LoggingServiceV2Client loggingServiceV2Client :
+   *       loggingServiceV2Client.ListMonitoredResourceDescriptors(request).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -721,7 +751,12 @@ public final ListLogsPagedResponse listLogs(String parent) {
    *
    * <pre>{@code
    * try (LoggingServiceV2Client loggingServiceV2Client = LoggingServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   BillingAccountName parent = BillingAccountName.of("[BILLING_ACCOUNT]");
+   *   ListLogsRequest request = ListLogsRequest.newBuilder().setParent(parent).build();
+   *   for (LoggingServiceV2Client loggingServiceV2Client :
+   *       loggingServiceV2Client.ListLogs(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/logging/MetricsServiceV2Client.java b/test/integration/goldens/logging/MetricsServiceV2Client.java
index 5ab7dc6ec80..bf3fac6f539 100644
--- a/test/integration/goldens/logging/MetricsServiceV2Client.java
+++ b/test/integration/goldens/logging/MetricsServiceV2Client.java
@@ -205,7 +205,12 @@ public final ListLogMetricsPagedResponse listLogMetrics(String parent) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   ProjectName parent = ProjectName.of("[PROJECT]");
+   *   ListLogMetricsRequest request = ListLogMetricsRequest.newBuilder().setParent(parent).build();
+   *   for (MetricsServiceV2Client metricsServiceV2Client :
+   *       metricsServiceV2Client.ListLogMetrics(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -294,7 +299,10 @@ public final LogMetric getLogMetric(String metricName) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogMetricName metric_name = LogMetricName.of("[PROJECT]", "[METRIC]");
+   *   GetLogMetricRequest request =
+   *       GetLogMetricRequest.newBuilder().setMetricName(metric_name).build();
+   *   LogMetric response = metricsServiceV2Client.GetLogMetric(request);
    * }
    * }</pre>
    *
@@ -380,7 +388,11 @@ public final LogMetric createLogMetric(String parent, LogMetric metric) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   ProjectName parent = ProjectName.of("[PROJECT]");
+   *   LogMetric metric = LogMetric.newBuilder().build();
+   *   CreateLogMetricRequest request =
+   *       CreateLogMetricRequest.newBuilder().setParent(parent).setMetric(metric).build();
+   *   LogMetric response = metricsServiceV2Client.CreateLogMetric(request);
    * }
    * }</pre>
    *
@@ -468,7 +480,11 @@ public final LogMetric updateLogMetric(String metricName, LogMetric metric) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogMetricName metric_name = LogMetricName.of("[PROJECT]", "[METRIC]");
+   *   LogMetric metric = LogMetric.newBuilder().build();
+   *   UpdateLogMetricRequest request =
+   *       UpdateLogMetricRequest.newBuilder().setMetricName(metric_name).setMetric(metric).build();
+   *   LogMetric response = metricsServiceV2Client.UpdateLogMetric(request);
    * }
    * }</pre>
    *
@@ -545,7 +561,10 @@ public final Empty deleteLogMetric(String metricName) {
    *
    * <pre>{@code
    * try (MetricsServiceV2Client metricsServiceV2Client = MetricsServiceV2Client.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   LogMetricName metric_name = LogMetricName.of("[PROJECT]", "[METRIC]");
+   *   DeleteLogMetricRequest request =
+   *       DeleteLogMetricRequest.newBuilder().setMetricName(metric_name).build();
+   *   Empty response = metricsServiceV2Client.DeleteLogMetric(request);
    * }
    * }</pre>
    *
diff --git a/test/integration/goldens/redis/CloudRedisClient.java b/test/integration/goldens/redis/CloudRedisClient.java
index 7607be4dd77..e20d84dca21 100644
--- a/test/integration/goldens/redis/CloudRedisClient.java
+++ b/test/integration/goldens/redis/CloudRedisClient.java
@@ -265,7 +265,12 @@ public final ListInstancesPagedResponse listInstances(String parent) {
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary paged default rpc method sample code.
+   *   LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
+   *   ListInstancesRequest request = ListInstancesRequest.newBuilder().setParent(parent).build();
+   *   for (CloudRedisClient cloudRedisClient :
+   *       cloudRedisClient.ListInstances(parent).iterateAll()) {
+   *     // doThingsWith(element);
+   *   }
    * }
    * }</pre>
    *
@@ -374,7 +379,9 @@ public final Instance getInstance(String name) {
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary default rpc method sample code.
+   *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
+   *   GetInstanceRequest request = GetInstanceRequest.newBuilder().setName(name).build();
+   *   Instance response = cloudRedisClient.GetInstance(request);
    * }
    * }</pre>
    *
@@ -520,7 +527,16 @@ public final OperationFuture<Instance, OperationMetadata> createInstanceAsync(
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   LocationName parent = LocationName.of("[PROJECT]", "[LOCATION]");
+   *   String instance_id = "instance_id-2101995259";
+   *   Instance instance = Instance.newBuilder().build();
+   *   CreateInstanceRequest request =
+   *       CreateInstanceRequest.newBuilder()
+   *           .setParent(parent)
+   *           .setInstanceId(instance_id)
+   *           .setInstance(instance)
+   *           .build();
+   *   Operation response = CloudRedisClient.createInstanceAsync(request).get();
    * }
    * }</pre>
    *
@@ -619,7 +635,14 @@ public final OperationFuture<Instance, OperationMetadata> updateInstanceAsync(
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   FieldMask update_mask = FieldMask.newBuilder().build();
+   *   Instance instance = Instance.newBuilder().build();
+   *   UpdateInstanceRequest request =
+   *       UpdateInstanceRequest.newBuilder()
+   *           .setUpdateMask(update_mask)
+   *           .setInstance(instance)
+   *           .build();
+   *   Operation response = CloudRedisClient.updateInstanceAsync(request).get();
    * }
    * }</pre>
    *
@@ -725,7 +748,11 @@ public final OperationFuture<Instance, OperationMetadata> upgradeInstanceAsync(
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
+   *   String redis_version = "redis_version-685310444";
+   *   UpgradeInstanceRequest request =
+   *       UpgradeInstanceRequest.newBuilder().setName(name).setRedisVersion(redis_version).build();
+   *   Operation response = CloudRedisClient.upgradeInstanceAsync(request).get();
    * }
    * }</pre>
    *
@@ -805,7 +832,11 @@ public final OperationFuture<Instance, OperationMetadata> importInstanceAsync(
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   String name = "name3373707";
+   *   InputConfig input_config = InputConfig.newBuilder().build();
+   *   ImportInstanceRequest request =
+   *       ImportInstanceRequest.newBuilder().setName(name).setInputConfig(input_config).build();
+   *   Operation response = CloudRedisClient.importInstanceAsync(request).get();
    * }
    * }</pre>
    *
@@ -895,7 +926,11 @@ public final OperationFuture<Instance, OperationMetadata> exportInstanceAsync(
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   String name = "name3373707";
+   *   OutputConfig output_config = OutputConfig.newBuilder().build();
+   *   ExportInstanceRequest request =
+   *       ExportInstanceRequest.newBuilder().setName(name).setOutputConfig(output_config).build();
+   *   Operation response = CloudRedisClient.exportInstanceAsync(request).get();
    * }
    * }</pre>
    *
@@ -1013,7 +1048,15 @@ public final OperationFuture<Instance, OperationMetadata> failoverInstanceAsync(
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
+   *   FailoverInstanceRequest.DataProtectionMode data_protection_mode =
+   *       FailoverInstanceRequest.DataProtectionMode.forNumber(0);
+   *   FailoverInstanceRequest request =
+   *       FailoverInstanceRequest.newBuilder()
+   *           .setName(name)
+   *           .setDataProtectionMode(data_protection_mode)
+   *           .build();
+   *   Operation response = CloudRedisClient.failoverInstanceAsync(request).get();
    * }
    * }</pre>
    *
@@ -1105,7 +1148,9 @@ public final OperationFuture<Empty, OperationMetadata> deleteInstanceAsync(Strin
    *
    * <pre>{@code
    * try (CloudRedisClient cloudRedisClient = CloudRedisClient.create()) {
-   *   // Note: Not Implement yet, placeholder for unary lro default rpc method sample code.
+   *   InstanceName name = InstanceName.of("[PROJECT]", "[LOCATION]", "[INSTANCE]");
+   *   DeleteInstanceRequest request = DeleteInstanceRequest.newBuilder().setName(name).build();
+   *   Operation response = CloudRedisClient.deleteInstanceAsync(request).get();
    * }
    * }</pre>
    *