Quote Originally Posted by DrByte View Post
Whether it's a general problem with that template or just with whatever javascript the template uses and/or javascript you've added, if there are any javascript errors on the checkout pages, the Square code won't be able to do its task, and therefore it won't receive a NONCE, and therefore it can't complete a payment.

Fix your javascript errors/conflicts. See the browser's javascript console for details.
Thank you, DrByte. I haven't added any code myself. I'll see about finding someone to assist with the errors.