@Override
            public ApiFuture<ListProductsInProductSetPagedResponse> getFuturePagedResponse(
                UnaryCallable<ListProductsInProductSetRequest, ListProductsInProductSetResponse>
                    callable,
                ListProductsInProductSetRequest request,
                ApiCallContext context,
                ApiFuture<ListProductsInProductSetResponse> futureResponse) {
              PageContext<
                      ListProductsInProductSetRequest, ListProductsInProductSetResponse, Product>
                  pageContext =
                      PageContext.create(
                          callable, LIST_PRODUCTS_IN_PRODUCT_SET_PAGE_STR_DESC, request, context);
              return ListProductsInProductSetPagedResponse.createAsync(pageContext, futureResponse);
            }
The default scopes of the service.
java-vision/google-cloud-vision/src/main/java/com/google/cloud/vision/v1/stub/ProductSearchStubSettings.java