Hello, i just intaled one-page checkout and i have this error: Your order's details have changed. Please review the current values and re-submit. When i click again Confirm order is ok.
155a , Westminster New Template
Was there any solution to this as I'm seeing the same issue.
The site is running on 1.5.5 and is using version 1.0.7 of One Page Checkout.
Shipping: storepickup and freeshipper
Payment: Sage Pay Form