/// <summary>
        /// Constructs a client wrapper for the InvoiceService service, with the specified gRPC client and settings.
        /// </summary>
        /// <param name="grpcClient">The underlying gRPC client.</param>
        /// <param name="settings">The base <see cref="InvoiceServiceSettings"/> used within this client.</param>
        public InvoiceServiceClientImpl(InvoiceService.InvoiceServiceClient grpcClient, InvoiceServiceSettings settings)
        {
            GrpcClient = grpcClient;
            InvoiceServiceSettings effectiveSettings = settings ?? InvoiceServiceSettings.GetDefault();
            gaxgrpc::ClientHelper  clientHelper      = new gaxgrpc::ClientHelper(effectiveSettings);

            _callListInvoices = clientHelper.BuildApiCall <ListInvoicesRequest, ListInvoicesResponse>(grpcClient.ListInvoicesAsync, grpcClient.ListInvoices, effectiveSettings.ListInvoicesSettings).WithGoogleRequestParam("customer_id", request => request.CustomerId);
            Modify_ApiCall(ref _callListInvoices);
            Modify_ListInvoicesApiCall(ref _callListInvoices);
            OnConstruction(grpcClient, effectiveSettings, clientHelper);
        }
        /// <summary>
        /// Creates a <see cref="InvoiceServiceClient"/> which uses the specified call invoker for remote operations.
        /// </summary>
        /// <param name="callInvoker">
        /// The <see cref="grpccore::CallInvoker"/> for remote operations. Must not be null.
        /// </param>
        /// <param name="settings">Optional <see cref="InvoiceServiceSettings"/>.</param>
        /// <returns>The created <see cref="InvoiceServiceClient"/>.</returns>
        internal static InvoiceServiceClient Create(grpccore::CallInvoker callInvoker, InvoiceServiceSettings settings = null)
        {
            gax::GaxPreconditions.CheckNotNull(callInvoker, nameof(callInvoker));
            grpcinter::Interceptor interceptor = settings?.Interceptor;

            if (interceptor != null)
            {
                callInvoker = grpcinter::CallInvokerExtensions.Intercept(callInvoker, interceptor);
            }
            InvoiceService.InvoiceServiceClient grpcClient = new InvoiceService.InvoiceServiceClient(callInvoker);
            return(new InvoiceServiceClientImpl(grpcClient, settings));
        }
 partial void OnConstruction(InvoiceService.InvoiceServiceClient grpcClient, InvoiceServiceSettings effectiveSettings, gaxgrpc::ClientHelper clientHelper);