feat(tenpayv3): 新增消费者投诉图片下载接口

src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecuteBillExtensions.cs

@@ -123,7 +123,8 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3
             if (request is null) throw new ArgumentNullException(nameof(request));
 
             IFlurlRequest flurlReq = client
-                .CreateRequest(request, HttpMethod.Get, request.DownloadUrl);
+                .CreateRequest(request, HttpMethod.Get);
+            flurlReq.Url = new Url(new Uri(request.DownloadUrl));
 
             return await client.SendRequestWithJsonAsync<Models.DownloadBillFileResponse>(flurlReq, cancellationToken: cancellationToken);
         }

src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Extensions/WechatTenpayClientExecuteMerchantServiceExtensions.cs

@@ -257,5 +257,26 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3
 
             return await client.SendRequestAsync<Models.UploadMerchantServiceImageResponse>(flurlReq, httpContent: httpContent, cancellationToken: cancellationToken);
         }
+
+        /// <summary>
+        /// <para>异步调用 [GET] /{download_url} 接口。</para>
+        /// <para>REF: https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter10_2_18.shtml </para>
+        /// <para>REF: https://pay.weixin.qq.com/wiki/doc/apiv3_partner/apis/chapter10_2_18.shtml </para>
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="request"></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        public static async Task<Models.DownloadMerchantServiceImageResponse> ExecuteDownloadMerchantServiceImageAsync(this WechatTenpayClient client, Models.DownloadMerchantServiceImageRequest request, CancellationToken cancellationToken = default)
+        {
+            if (client is null) throw new ArgumentNullException(nameof(client));
+            if (request is null) throw new ArgumentNullException(nameof(request));
+
+            IFlurlRequest flurlReq = client
+                .CreateRequest(request, HttpMethod.Get);
+            flurlReq.Url = new Url(new Uri(request.DownloadUrl));
+
+            return await client.SendRequestWithJsonAsync<Models.DownloadMerchantServiceImageResponse>(flurlReq, cancellationToken: cancellationToken);
+        }
     }
 }

src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/MerchantService/ComplaintsV2/DownloadMerchantServiceImageRequest.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
+{
+    /// <summary>
+    /// <para>表示 [GET] /{download_url} 接口的请求。</para>
+    /// </summary>
+    public class DownloadMerchantServiceImageRequest : WechatTenpayRequest
+    {
+        /// <summary>
+        /// 获取或设置图片下载地址。
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public string DownloadUrl { get; set; } = string.Empty;
+    }
+}

src/SKIT.FlurlHttpClient.Wechat.TenpayV3/Models/MerchantService/ComplaintsV2/DownloadMerchantServiceImageResponse.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Models
+{
+    /// <summary>
+    /// <para>表示 [GET] /{download_url} 接口的响应。</para>
+    /// </summary>
+    public class DownloadMerchantServiceImageResponse : WechatTenpayResponse
+    {
+        public override bool IsSuccessful()
+        {
+            return base.IsSuccessful() && RawBytes.Length > 0;
+        }
+    }
+}