feat(work): 新增第三方应用查询充值账户余额接口

src/SKIT.FlurlHttpClient.Wechat.Work/Extensions/WechatWorkClientExecuteCgibinServiceExtensions.cs

@@ -256,6 +256,29 @@ namespace SKIT.FlurlHttpClient.Wechat.Work
             return await client.SendFlurlRequestAsJsonAsync<Models.CgibinServiceGetAppQrcodeResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
         }
 
+        /// <summary>
+        /// <para>异步调用 [GET] /cgi-bin/service/get_account_balance 接口。</para>
+        /// <para>
+        /// REF: <br/>
+        /// <![CDATA[ https://developer.work.weixin.qq.com/document/path/100137 ]]>
+        /// </para>
+        /// </summary>
+        /// <param name="client"></param>
+        /// <param name="request"></param>
+        /// <param name="cancellationToken"></param>
+        /// <returns></returns>
+        public static async Task<Models.CgibinServiceGetAccountBalanceResponse> ExecuteCgibinServiceGetAccountBalanceAsync(this WechatWorkClient client, Models.CgibinServiceGetAccountBalanceRequest 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
+                .CreateFlurlRequest(request, HttpMethod.Get, "cgi-bin", "service", "get_account_balance")
+                .SetQueryParam("provider_access_token", request.ProviderAccessToken);
+
+            return await client.SendFlurlRequestAsJsonAsync<Models.CgibinServiceGetAccountBalanceResponse>(flurlReq, data: request, cancellationToken: cancellationToken).ConfigureAwait(false);
+        }
+
         #region Register
         /// <summary>
         /// <para>异步调用 [POST] /cgi-bin/service/get_register_code 接口。</para>

src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinService/CgibinServiceGetAccountBalanceRequest.cs

@@ -0,0 +1,15 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [GET] /cgi-bin/service/get_account_balance 接口的请求。</para>
+    /// </summary>
+    public class CgibinServiceGetAccountBalanceRequest : WechatWorkRequest
+    {
+        /// <summary>
+        /// 获取或设置服务商 AccessToken。
+        /// </summary>
+        [Newtonsoft.Json.JsonIgnore]
+        [System.Text.Json.Serialization.JsonIgnore]
+        public string ProviderAccessToken { get; set; } = string.Empty;
+    }
+}

src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinService/CgibinServiceGetAccountBalanceResponse.cs

@@ -0,0 +1,15 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [GET] /cgi-bin/service/get_account_balance 接口的响应。</para>
+    /// </summary>
+    public class CgibinServiceGetAccountBalanceResponse : WechatWorkResponse
+    {
+        /// <summary>
+        /// 获取或设置充值账户余额（单位：分）。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("balance")]
+        [System.Text.Json.Serialization.JsonPropertyName("balance")]
+        public int Balance { get; set; }
+    }
+}

test/SKIT.FlurlHttpClient.Wechat.Work.UnitTests/ModelSamples/CgibinService/CgibinServiceGetAccountBalanceResponse.json

@@ -0,0 +1,5 @@
+{
+    "errcode": 0,
+    "errmsg": "ok",
+    "balance": 1000090
+}