feat(work): 新增获取收款项目的商户单号相关接口

src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinExternalPay/Payment/CgibinExternalPayGetPaymentInfoRequest.cs

@@ -0,0 +1,15 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/externalpay/get_payment_info 接口的请求。</para>
+    /// </summary>
+    public class CgibinExternalPayGetPaymentInfoRequest : WechatWorkRequest
+    {
+        /// <summary>
+        /// 获取或设置收款项目 ID。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("payment_id")]
+        [System.Text.Json.Serialization.JsonPropertyName("payment_id")]
+        public string PaymentId { get; set; } = string.Empty;
+    }
+}

src/SKIT.FlurlHttpClient.Wechat.Work/Models/CgibinExternalPay/Payment/CgibinExternalPayGetPaymentInfoResponse.cs

@@ -0,0 +1,28 @@
+namespace SKIT.FlurlHttpClient.Wechat.Work.Models
+{
+    /// <summary>
+    /// <para>表示 [POST] /cgi-bin/externalpay/get_payment_info 接口的响应。</para>
+    /// </summary>
+    public class CgibinExternalPayGetPaymentInfoResponse : WechatWorkResponse
+    {
+        public static class Types
+        {
+            public class Bill
+            {
+                /// <summary>
+                /// 获取或设置商户单号。
+                /// </summary>
+                [Newtonsoft.Json.JsonProperty("out_trade_no")]
+                [System.Text.Json.Serialization.JsonPropertyName("out_trade_no")]
+                public string OutTradeNumber { get; set; } = default!;
+            }
+        }
+
+        /// <summary>
+        /// 获取或设置收款单列表。
+        /// </summary>
+        [Newtonsoft.Json.JsonProperty("bill_list")]
+        [System.Text.Json.Serialization.JsonPropertyName("bill_list")]
+        public Types.Bill[] BillList { get; set; } = default!;
+    }
+}