What goes into creating the card fingerprint? Is it possible for me to determine the card fingerprint based on details from the credit card and other user details? My goal is to create a way to connect a customer in my database to a sale made in Square when a customer was not linked to the Square sale. If I could predict the fingerprint, then I could:
- Have the user connect their credit card to my site
- I determine the Square fingerprint that will be generated by Square
- The customer orders with the same credit card
- When a payment comes in with the matching fingerprint, I know which user made the order.
If this isn’t possible, is there some other unique identifier within Square that is associated with each user, but that I can determine before a purchase is made?
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