i have no control over those fields. square controls all of that.
what logic they use to determine which fields they need in order to successfully a charge a card is not something that has really interested me. but they do things differently based on where you are located, various risk factors, etc.
in memory serves me correctly, i believe in europe they ask for an additional field as well. part of the anti-fraud movement.
but for the most part anything within the square box is controlled by them and not by me.
best.
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