Quote Originally Posted by Nick1973 View Post
hi cindy,

I have just installed OPC 2.4.1 on 1.5.7d running PHP 7.4 and I am getting this after card details have been entered and when clicking 'confirm order'

Your order's details have changed. Please review the current values and re-submit.

So I entered my card details again, and when I reconfirm the order, it goes through without a problem.
What payment method? It sounds like something's not being recorded in the session on the initial 'confirm' click.