Shop not redirecting to Realex for payment

Hello,

My website has been working for several months with no issues. I have recently upgraded the version of WordRress, Jigoshop and also the Jigoshop plugins that are being used.

I am using a Realex for Jigoshop plugin that redirects the customer to Realex where they are presented with a form and can enter their card details.

This redirect no longer works, instead the customer is presented with the

Checkout -> Pay page

None of the orders can therefore be processed, has anyone came across a similar issue? Any help would be greatly appreciated.

Thanks
Gavin

https://www.ads-software.com/plugins/jigoshop/