What happened when the card supermarket bound by WeChat didn't send text messages when paying?

SMS notification of bank card requires SMS fee. If your mobile phone number is in arrears, you may not receive information notification, and you must pay to use it normally.

Another situation is to look at the amount set by the bank card, and some are lower than the amount without SMS reminder. Some have set up fast payment, and there is no SMS reminder, but WeChat will have payment vouchers. This is safe to use, no problem.