代码修改后的版本，全部提交

TencentCloud/Cdb/V20170320/Models/RenewDBInstanceRequest.cs

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+/*
+ * Copyright (c) 2018 THL A29 Limited, a Tencent company. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+namespace TencentCloud.Cdb.V20170320.Models
+{
+    using Newtonsoft.Json;
+    using System.Collections.Generic;
+    using TencentCloud.Common;
+
+    public class RenewDBInstanceRequest : AbstractModel
+    {
+        
+        /// <summary>
+        /// 待续费的实例 ID，格式如：cdb-c1nl9rpv，与云数据库控制台页面中显示的实例 ID 相同，可使用 [查询实例列表](https://cloud.tencent.com/document/api/236/15872)。
+        /// </summary>
+        [JsonProperty("InstanceId")]
+        public string InstanceId{ get; set; }
+
+        /// <summary>
+        /// 续费时长，单位：月，可选值包括 [1,2,3,4,5,6,7,8,9,10,11,12,24,36]。
+        /// </summary>
+        [JsonProperty("TimeSpan")]
+        public long? TimeSpan{ get; set; }
+
+        /// <summary>
+        /// 如果需要将按量计费实例续费为包年包月的实例，该入参的值需要指定为 "PREPAID" 。
+        /// </summary>
+        [JsonProperty("ModifyPayType")]
+        public string ModifyPayType{ get; set; }
+
+
+        /// <summary>
+        /// For internal usage only. DO NOT USE IT.
+        /// </summary>
+        internal override void ToMap(Dictionary<string, string> map, string prefix)
+        {
+            this.SetParamSimple(map, prefix + "InstanceId", this.InstanceId);
+            this.SetParamSimple(map, prefix + "TimeSpan", this.TimeSpan);
+            this.SetParamSimple(map, prefix + "ModifyPayType", this.ModifyPayType);
+        }
+    }
+}
+