Square Payment Module for Zen Cart [Support Thread]

[John Large]

No matter how many times I remove the square module and reinstall, generate a new sandbox OAuth secret & try to use the sandbox credentials, whenever I click the green button in ZC to get tokens via OAuth, I receive this error. If I use my production credentials, the module receives its tokens and becomes active.

Also, could you take a screenshot of the modal challenge that pops up on your website if the transaction does require a two-factor code such as via text or email for SCA? I'm curious to see how this looks and at what point it is shown. I've tried a few test transactions using my own cards and as yet haven't seen any challenges.