http请求方式：POST
https://api.weixin.qq.com/product/coupon/get_list?access_token=xxxxxxxxx

{
    "start_create_time": "2020-03-25 12:05:25",
    "end_create_time": "2020-04-25 12:05:25",
    "status": 2,
    "page": 1,
    "page_size": 10
}

{
    "errcode": 0,
    "errmsg": "ok",
    "coupons": 
    [
        {
            "coupon_id": 123,
            "type": 1,
            "status": 1,
            "create_time": "2020-05-30 00:00:00",
            "update_time": "2020-05-30 12:00:00",
            "coupon_info":
            {
                "name": "服饰满100-50",
                "valid_info": 
                {
                    "valid_type": 1
                    "valid_day_num": 0                      //valid_type=2时才有意义
                    "start_time": "2020-06-01 00:00:00"     //valid_type=1时才有意义
                    "end_time": "2020-07-01 00:00:00"       //valid_type=1时才有意义
                },
                "promote_info":
                {
                    "promote_type": 1       // 1:店铺内推广,2:自定义推广渠道,3:定向优惠
                    "customize_channel": "xxxx" //自定义推广渠道具体内容，promote_type=2时才有意义
                }
            },
            "stock_info":
            {
                "issued_num": 100,
                "receive_num": 100,
                "used_num": 100
            }
        }
    ]
}