Take credit cards as an example. A receipt usually refers to a bank. You buy things by credit card, sign and leave. The merchant leaves your signed purchase order and gives it to the bank that sends it to the credit card machine. This bank is an acquiring bank. After receiving your purchase order at that time, the acquiring institution will pay the merchant according to the above amount. Businessmen will get the payment.
The acquiring bank then asks the issuing bank for money through the UnionPay platform. Just return it to the issuing bank.
Of course it's not that simple. There is a handling fee for every link, otherwise the bank and UnionPay will have no money to earn. In fact, the whole process of swiping cards is realized through UnionPay, a shared intermediate link network.