@Override
            public ListCustomClassesRequest injectToken(
                ListCustomClassesRequest payload, String token) {
              return ListCustomClassesRequest.newBuilder(payload).setPageToken(token).build();
            }
The default scopes of the service.
java-speech/google-cloud-speech/src/main/java/com/google/cloud/speech/v1p1beta1/stub/AdaptationStubSettings.java