I've configured authorize.net using the API login and transaction key provided to me. When testing the shopping cart, I receive a blank page when submitting after entering the credit card information. Both my bank and authorize.net tell me it's a shopping cart issue. When testing alternative payment methods such as "payment on delivery" the cart functions without a problem and the confirmation message is visible (no blank page).
Very frustrated. Any help would be appreciated.
actually... now no payment methods work. Anytime I submit an order for payment... it goes to the blank screen! Ugh!