Thank you for this module, Dr. Byte. We've been using Paypal for card payments for years but some people seem to run a mile as soon as they see the Paypal brand. I set up a Square account a few days ago along with this module. It took me about half an hour from not having an account to running a test transaction in Zen Cart.

Anyway, I see that Square has just updated their API to handle the European PSD2/SCA (Strong Customer Authentication) regulations that come into force in a couple of months. I'm assuming this module will need an update to handle that?