Scan code payment is to open the online payment function of credit card (debit card), then bind the card to the third-party payment platforms such as UnionPay, China UnionPay Express or Alipay, WeChat, and then scan the QR code presented by the merchant when shopping, select the bound credit card (debit card) as the debit account, and then enter the payment password.
As for credit card (debit card) payment, it is to directly insert the card into the card slot below the POS machine or across the side of the card slot, and then enter the payment password on the POS machine (just sign it after issuing the bill).