/// <summary>
        /// Constructs a client wrapper for the Identity service, with the specified gRPC client and settings.
        /// </summary>
        /// <param name="grpcClient">The underlying gRPC client.</param>
        /// <param name="settings">The base <see cref="IdentitySettings"/> used within this client.</param>
        /// <param name="logger">Optional <see cref="mel::ILogger"/> to use within this client.</param>
        public IdentityClientImpl(Identity.IdentityClient grpcClient, IdentitySettings settings, mel::ILogger logger)
        {
            GrpcClient = grpcClient;
            IdentitySettings      effectiveSettings = settings ?? IdentitySettings.GetDefault();
            gaxgrpc::ClientHelper clientHelper      = new gaxgrpc::ClientHelper(effectiveSettings, logger);

            _callCreateUser = clientHelper.BuildApiCall <CreateUserRequest, User>("CreateUser", grpcClient.CreateUserAsync, grpcClient.CreateUser, effectiveSettings.CreateUserSettings);
            Modify_ApiCall(ref _callCreateUser);
            Modify_CreateUserApiCall(ref _callCreateUser);
            _callGetUser = clientHelper.BuildApiCall <GetUserRequest, User>("GetUser", grpcClient.GetUserAsync, grpcClient.GetUser, effectiveSettings.GetUserSettings).WithGoogleRequestParam("name", request => request.Name);
            Modify_ApiCall(ref _callGetUser);
            Modify_GetUserApiCall(ref _callGetUser);
            _callUpdateUser = clientHelper.BuildApiCall <UpdateUserRequest, User>("UpdateUser", grpcClient.UpdateUserAsync, grpcClient.UpdateUser, effectiveSettings.UpdateUserSettings).WithGoogleRequestParam("user.name", request => request.User?.Name);
            Modify_ApiCall(ref _callUpdateUser);
            Modify_UpdateUserApiCall(ref _callUpdateUser);
            _callDeleteUser = clientHelper.BuildApiCall <DeleteUserRequest, wkt::Empty>("DeleteUser", grpcClient.DeleteUserAsync, grpcClient.DeleteUser, effectiveSettings.DeleteUserSettings).WithGoogleRequestParam("name", request => request.Name);
            Modify_ApiCall(ref _callDeleteUser);
            Modify_DeleteUserApiCall(ref _callDeleteUser);
            _callListUsers = clientHelper.BuildApiCall <ListUsersRequest, ListUsersResponse>("ListUsers", grpcClient.ListUsersAsync, grpcClient.ListUsers, effectiveSettings.ListUsersSettings);
            Modify_ApiCall(ref _callListUsers);
            Modify_ListUsersApiCall(ref _callListUsers);
            OnConstruction(grpcClient, effectiveSettings, clientHelper);
        }