Problem: Calling alipy.trade.wap.pay shows that the system is busy
solve:
Wrong order number, contains spaces
out_trade_no refers to the unique order number of the merchant's website, which is unique on the merchant side. Each merchant's order number will correspond to an Alipay order number. This order number is generated by Coral itself. The merchant's order number must be within 64 characters and can include letters, numbers, and underscores. ; Need to ensure that it is not repeated on the merchant side, the recommended format is current time + custom number