I've setup my store to only allow checkout via Paypal. I've disabled the "checkout" button in the cart, so the only option from the cart, is to checkout via Paypal. (There was a bunch of validation errors on the checkout screen when trying to pay only through Paypal, as a guest account). However, if I use a coupon that brings the total to $0.00, I get the error message:
Error: There was an error processing your payment: (10401 Transaction refused because of an invalid argument. See additional error messages for details.) Order total is invalid.
If I try and fill in the rest of the information as a guest, I get the error:
Error: Please enter a password.
But of course, since I'm checking out as a guest, there is no password field.
Please advise whats not lining up here. I can whisper my website URL.