支付中签约接口返回的签约信息system_error 请求参数为： wx00ff92fabe2dcaba服务contract_appid>wx00ff92fabe2dcaba/contract_appid>contract_display_account>WithHolding/contract_display_account>contract_mchid>1305666901/contract_mchid>contract_notify_url>****/contract_notify_url>mch_id>1305666901/mch_id>nonce_str>74249bfb363306265299ac4ec44d3cb6/nonce_str>notify_url>***/notify_url>out_trade_no>18920083101110626/out_trade_no>plan_id>12712/plan_id>request_serial>1598865217672/request_serial>A2B8D8F25BA3AB6D1C8D119E54261A21spbill_create_ip>127.0.0.01/spbill_create_ip>total_fee>1/total_fee>trade_type>MWEB/trade_type>