I have a form that uses the product options field to select Lump Sum, 6 Payments, or 12 Payments. The 6 and 12 payments work as expected; however, the Lump Sum does returns "There was an error processing your credit card." If I change the settings from Product or Service to Subscription it works. What am I doing wrong on the single product auth.net settings? It's really straight forward.
I am using a billing address, send auth.net receipt, and auth.net condition.
The form is located here: https://restlesslegtreatment.ca/checkoutclick/