Quote Originally Posted by brittainmark View Post
You can use Square as long as you add the fix https://www.zen-cart.com/showthread....77#post1381277

Would be really useful to get this added to the core.
Done. Pull request #4624 this have been done against 1.5.8 stream but i do not think it has changed since 1.5.7
Currently in my git hub as brittainmark:Square_SCA_Compliance
You will need the following files
/includes/modules/pages/checkout_payment/jscript_square.php
/includes/modules/payment/square.php
overwrite the originals and it should work.

Please note: This was done by @Rocketsites and @Congerman