We have implemented Google Checkout (sandbox environment) as a payment gateway on the admin panel, using the instructions given by AbleCommerce. However, the coupon code I entered came back with the following response: "Invalid coupon code Retry Your promotion code (henrya35) could not be applied at this time."
FYI, the coupon code I applied works fine on the normal checkout (on the development site). Does anyone know what is wrong here, or do I have to do something differently?
Please help. Thanks!
Alan