{     "stock_name": "8月8日活动券",     "belong_merchant": "1712620888",     "goods_name": "6975858960889",     "comment":"夏季促销活动",     "stock_type": "NORMAL",     "coupon_use_rule": {         "coupon_available_time": {             "available_begin_time": "2025-06-28T13:29:35+08:00",             "available_end_time": "2025-06-30T13:29:35+08:00"                 },         "fixed_normal_coupon": {             "discount_amount": 1,             "transaction_minimum": 5         },                "use_method": "SELF_CONSUME"     },     "stock_send_rule": {             "max_coupons":1000,         "max_coupons_per_user": 5                  },     "coupon_code_mode": "WECHATPAY_MODE" }