Originally Posted by Tim Soles
We are currently testing using PHP 7 2.7 and SagePay is failing when using the Edge browser. Firefox and IE work OK. Haven't tried any other browsers.
When you click the Submit order button it goes to the SagePay site but there is a large 'Error Processing Transaction' message. The Status Detail is '5080: Form transaction registration failed'
We have localized the problem.
The solution is using a unique order prefix for different stores.
The order prefix can be set on the page like