/// <summary>
 /// Updates the fulfillment.
 /// </summary>
 /// <param name="fulfillment">
 /// Required. The fulfillment to update.
 /// </param>
 /// <param name="updateMask">
 /// Required. The mask to control which fields get updated. If the mask is not
 /// present, all fields will be updated.
 /// </param>
 /// <param name="cancellationToken">A <see cref="st::CancellationToken"/> to use for this RPC.</param>
 /// <returns>A Task containing the RPC response.</returns>
 public virtual stt::Task <Fulfillment> UpdateFulfillmentAsync(Fulfillment fulfillment, wkt::FieldMask updateMask, st::CancellationToken cancellationToken) =>
 UpdateFulfillmentAsync(fulfillment, updateMask, gaxgrpc::CallSettings.FromCancellationToken(cancellationToken));
 /// <summary>
 /// Updates the fulfillment.
 /// </summary>
 /// <param name="fulfillment">
 /// Required. The fulfillment to update.
 /// </param>
 /// <param name="updateMask">
 /// Required. The mask to control which fields get updated. If the mask is not
 /// present, all fields will be updated.
 /// </param>
 /// <param name="callSettings">If not null, applies overrides to this RPC call.</param>
 /// <returns>A Task containing the RPC response.</returns>
 public virtual stt::Task <Fulfillment> UpdateFulfillmentAsync(Fulfillment fulfillment, wkt::FieldMask updateMask, gaxgrpc::CallSettings callSettings = null) =>
 UpdateFulfillmentAsync(new UpdateFulfillmentRequest
 {
     Fulfillment = gax::GaxPreconditions.CheckNotNull(fulfillment, nameof(fulfillment)),
     UpdateMask  = gax::GaxPreconditions.CheckNotNull(updateMask, nameof(updateMask)),
 }, callSettings);