I have the Square Plugin installed and configured for WooCommerce. I get the same error if I am using Sandbox or Live.
I can type in customer information in Billing Details on Check Out page. It gives me no place to enter credit card number and when I select place order it gives me the following error – “An error occured, please try again or try an alternate form of payment.”
I have been through every setting multiple times and can not figure out how to fix this.