Issues With Orders After Upgrade To Php 8.1

We are having an issue with orders.  If they are paid via credit card (we use authorize.net (SIM) method) The screen goes blank, the order processes on the credit card system but it remains a shopping cart on the system. 

It is also showing 4K in sales today, which would be wonderful, but we haven't had.  

Any ideas? 

Suzanne

The Authorize.net SIM method is probably not compatible with PHP 8.1. It has actually been removed from Sytist unless it was already active.

You should use the Authorize.net AIM method instead. Copy your credentials over to that one. The AIM method they enter in their card information on your site.

The sales total probably has something to do with the failed orders. Check the Orders section.