Added a random input field on the checkout and after filling everything in and getting to the payment page the error log shows
[01-Dec-2016 17:22:07 UTC] PHP Notice: Undefined variable: field in D:\MAMP\htdocs\wpec-master\wp-content\plugins\WP-e-Commerce\wpsc-components\theme-engine-v2\helpers\form-validation.php on line 65
[01-Dec-2016 17:22:07 UTC] PHP Notice: Undefined variable: value in D:\MAMP\htdocs\wpec-master\wp-content\plugins\WP-e-Commerce\wpsc-components\theme-engine-v2\helpers\form-validation.php on line 65
It also looks like if you make the field mandatory and leave it empty there is no validation.
Added a random input field on the checkout and after filling everything in and getting to the payment page the error log shows
It also looks like if you make the field mandatory and leave it empty there is no validation.