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What pen should I use to sign on the back of the bank card?
Write with a ballpoint pen, that is, the kind that is written immediately. Don't use ink pen, it won't take long for your signature to run out.

The function of signature on the back of bank card:

It is easy to recognize that this is your card. For example, if you swipe your card while shopping, you can copy someone else's malicious card change and find it immediately.

Convenient for customers to claim by card.