Square Payment Module for Zen Cart [Support Thread]

[DrByte]

SQ-NONCE-FAILURE appears when the javascript code in your template has errors and is preventing the javascript for the module from executing properly.
This is often caused by other plugins that are using outdated javascript or old versions of jQuery. It can also happen if you're using a template designed for an older version of Zen Cart and therefore have an old jscript_framework.php file in your template's jscript folder.

Thanks!
But how do I find out how to fix it?

Ya, that's the challenging part. Teaching someone javascript-debugging is hard to do in a single post! Can't really do that here. There are a dozen discussions of the same issue earlier in this thread, all with varying examples of the same situation as yours. So I'd start there.
Additionally, you can use your browser's "console log" to inspect the actual javascript errors that are occurring when the checkout_payment page is being loaded, and when the submit button is clicked. Using the information reported there can help you understand what javascript conflicts might exist and need fixing.