Is there a way to prevent duplicate cards being made for the same customer using the customers API?
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Hi @Tcadet0 welcome to the forums!
Unfortunately at this time, Square does not automatically check for duplicated cards. You can try to do some prevention by showing the customer their current card(s) on file (which you can get from the Customers API and includes last 4, brand, expiration month/year), but of course if the customer still chose to add the same card, Square would not catch it.