Hello, if you use a credit card, first of all, the signature column on the back of the credit card needs to be signed before it can be accepted. The printed purchase order must be signed, and it needs to be compared with the signature column on the back of the credit card, and the handwriting is similar, so that the transaction is successful. If the signature column on the back is unsigned or the signature of the purchase order does not match the signature column of the card, it will not be accepted!