Path： /ip/open-api/proxy-buy
Method： POST
接口描述：购买代理
参数说明：
| 参数名 | 是否必须 | 示例 | 备注 | 使用场景 |
| days | 是 | 30 | 天数 | |
| area_id | 是 | 239 | 地区ID | |
| auto_extend | 是 | 1 | 自动续费 0 关闭 1开启 | |
| num | 是 | 1 | 数量 <= 100 |
返回数据：
{
"data": {
"order_id": "g1k29a2"
},
"code": 0,
"msg": "Success"
}
字段说明：
| order_id | 订单ID |
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