/// <summary>Creates copy of Face entity by FaceId and this Face will be linked to WatchlistItem by WatchlistItemId.</summary>
        /// <param name="payload">JSON with FaceId and WatchlistItemId.</param>
        /// <returns>Creates copy of Face entity by FaceId and this Face will be linked to WatchlistItem by WatchlistItemId.</returns>
        /// <exception cref="SwaggerException">A server side error occurred.</exception>
        /// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
        public async System.Threading.Tasks.Task <FileResponse> AddExistingFaceAsync(AddExistingFaceToWlItemData payload, System.Threading.CancellationToken cancellationToken)
        {
            var urlBuilder_ = new System.Text.StringBuilder();

            urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd('/') : "").Append("/rpc/WatchlistItems/AddExistingFace");

            var client_ = _httpClient;

            try
            {
                using (var request_ = new System.Net.Http.HttpRequestMessage())
                {
                    var content_ = new System.Net.Http.StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(payload, _settings.Value));
                    content_.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("application/json");
                    request_.Content             = content_;
                    request_.Method = new System.Net.Http.HttpMethod("POST");
                    request_.Headers.Accept.Add(System.Net.Http.Headers.MediaTypeWithQualityHeaderValue.Parse("application/json"));

                    PrepareRequest(client_, request_, urlBuilder_);
                    var url_ = urlBuilder_.ToString();
                    request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
                    PrepareRequest(client_, request_, url_);

                    var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);

                    try
                    {
                        var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
                        if (response_.Content != null && response_.Content.Headers != null)
                        {
                            foreach (var item_ in response_.Content.Headers)
                            {
                                headers_[item_.Key] = item_.Value;
                            }
                        }

                        ProcessResponse(client_, response_);

                        var status_ = ((int)response_.StatusCode).ToString();
                        if (status_ == "204" || status_ == "206")
                        {
                            var responseStream_ = response_.Content == null ? System.IO.Stream.Null : await response_.Content.ReadAsStreamAsync().ConfigureAwait(false);

                            var fileResponse_ = new FileResponse((int)response_.StatusCode, headers_, responseStream_, null, response_);
                            client_ = null; response_ = null; // response and client are disposed by FileResponse
                            return(fileResponse_);
                        }
                        else
                        if (status_ != "200" && status_ != "204")
                        {
                            var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);

                            throw new SwaggerException("The HTTP status code of the response was not expected (" + (int)response_.StatusCode + ").", (int)response_.StatusCode, responseData_, headers_, null);
                        }

                        return(default(FileResponse));
                    }
                    finally
                    {
                        if (response_ != null)
                        {
                            response_.Dispose();
                        }
                    }
                }
            }
            finally
            {
            }
        }
 /// <summary>Creates copy of Face entity by FaceId and this Face will be linked to WatchlistItem by WatchlistItemId.</summary>
 /// <param name="payload">JSON with FaceId and WatchlistItemId.</param>
 /// <returns>Creates copy of Face entity by FaceId and this Face will be linked to WatchlistItem by WatchlistItemId.</returns>
 /// <exception cref="SwaggerException">A server side error occurred.</exception>
 public System.Threading.Tasks.Task <FileResponse> AddExistingFaceAsync(AddExistingFaceToWlItemData payload)
 {
     return(AddExistingFaceAsync(payload, System.Threading.CancellationToken.None));
 }