mch_id
curl --location --request POST 'https://cwallet-openapi-ewtest.lianlianpay.com/card/v2/balance/adjust/query?mch_id=undefined&out_order_no=undefined'
{ "ret_code": "000000", "ret_msg": "success", "mch_id": "123456789012345678", "out_order_no": "RECHARGE20260518001", "account_no": "987654321", "adjust_type": "CARD_RECHARGE", "adjust_amount": "300.00", "order_status": "PROCESSING", "card_fund_mode": "RECHARGE", "create_time": "2026-05-18 10:30:00", "update_time": "2026-05-18 10:30:00" }