When brushing the POS machine, there will generally be a transaction status prompt. If the POS machine swipes the card successfully and deducts money from the credit card, this situation is that the consumption is successful.

When swiping a card, POS will send instructions to the issuing bank for consumption. After consumption, the issuing bank will send instructions to the acquiring institution, and the acquiring institution will succeed only after receiving the instructions. However, due to the poor signal, the acquiring institution may not receive the instructions sent by the issuing bank and cannot print the credit card receipt. This is the case when the transaction fails.