Quote Originally Posted by GFyfe View Post

It keeps generating an error “[RESPMSG] => Invalid vendor account”. [RESULT] => 26.

...


I have signed up for an account with Paypal Payflow Pro, but haven't paid for it yet, so it's still in test mode.
"Invalid Vendor Account" means you've not given valid user/vendor/partner/password information. And, if you've not received those items from PayPal and/or your account isn't activated yet, of course you're going to get that error.