WooCommerce – Simplify Commerce Javascript Error

I have my Woo Commerce plug-in integrated with Simplified Commerce as my payment system. In production (the sandbox is disabled), after inputting my credit card information, I’m presented with the following error:

Please make sure your card details have been entered correctly and that your browser supports JavaScript.

I’m leveraging the Zerif Lite theme on my site. The API keys are inputted correctly to WooCommerce, javascript is enabled on the broswer… What am I missing? How can I correct this error?

https://wordpress.org/plugins/woocommerce/