Authorization error: 'CARD_NOT_SUPPORTED'

[MarkTLBB]

Trying to process online payments via my website - Square is fully integrated and seems all setup but can not successfully accept payments yet!! Anyone know what to do when this error message Authorization error: 'CARD_NOT_SUPPORTED' keeps coming up when trying to send through a payment - have tested multiple cards and the Test card codes and all the same. 

[MayaP]

Hey @MarkTLBB, thanks so much for joining and reaching out to the community — I’m really happy to have you here!

This definitely sounds frustrating, and I want to help get it sorted. I just want to make sure I understand correctly: you’re using Square to process payments on your own site, right? Could you share a few photos of what you’re seeing on your end, and also a link to your site?