feat(tenpayv3): 新增平台收付通发起异常退款相关接口

test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/_Partner/Ecommerce/Refunds/CreateEcommerceAbnormalRefundApplyRequest.json

@@ -0,0 +1,9 @@
+{
+    "sub_mchid": "1900000109",
+    "individual_auth_id": "1900000110",
+    "out_refund_no": "1217752501201407033233368018",
+    "type": "USER_BANK_CARD",
+    "bank_type": "ICBC_DEBIT",
+    "bank_account": "d+xT+MQCvrLHUVDWv/8MR/dB7TkXLVfSrUxMPZy6jWWYzpRrEEaYQE8ZRGYoeorwC+w==",
+    "real_name": "UPgQcZSdq3zOayJwZ5XLrHY2dZU1W2Cd"
+}

test/SKIT.FlurlHttpClient.Wechat.TenpayV3.UnitTests/ModelSamples/_/_Partner/Ecommerce/Refunds/CreateEcommerceAbnormalRefundApplyResponse.json

@@ -0,0 +1,35 @@
+{
+    "refund_id": "1217752501201407033233368018",
+    "out_refund_no": "1217752501201407033233368018",
+    "transaction_id": "1217752501201407033233368018",
+    "out_trade_no": "1217752501201407033233368018",
+    "channel": "ORIGINAL",
+    "user_received_account": "招商银行信用卡0403",
+    "success_time": "2018-06-08T10:34:56+08:00",
+    "create_time": "2018-06-08T10:34:56+08:00",
+    "status": "SUCCESS",
+    "amount": {
+        "refund": 888,
+        "from": [
+            {
+                "account": "AVAILABLE",
+                "amount": 444
+            }
+        ],
+        "payer_refund": 888,
+        "discount_refund": 888,
+        "currency": "CNY",
+        "advance": 888
+    },
+    "promotion_detail": [
+        {
+            "promotion_id": "109519",
+            "scope": "SINGLE",
+            "type": "DISCOUNT",
+            "amount": 5,
+            "refund_amount": 100
+        }
+    ],
+    "refund_account": "REFUND_SOURCE_SUB_MERCHANT",
+    "funds_account": "UNSETTLED"
+}