I keep getting this error message after credit cards are processed using authorize.net(SIM). (AIM is not an option for my cart)
Zen Cart 1.5.1 (new install)
PHP Version: 5.4.16
MySQL 5.6.10
When checking out, customers are redirected to my payment services provider (eProcessingNetwork) to enter their card information. Once information is entered and submitted, the chard is charged and the customer sees an unformated version of my cart page with the error message:
"Whoops! Your session has expired. If you were placing an order, please login and your shopping cart will be restored. You may then go back to the checkout and complete your final purchases."
The URL still shows the eProssessingNetwork address.
I have read many posts about this error but most only see it occasionally. This happens with every credit card transaction and none of the solutions have helped.
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