I'm working on an EPiServer 8 MVC implementation and I can't see how to trigger the payment process.
I've got my payment provider registered in Commerce Manager and I'm adding a payment to my OrderForm, Accepting Changes on the Cart, running the CartCheckoutWorkflow and saving the Cart as a Purchase Order but at no point in my payment provider triggered.
I've got the EPiServer.Commerce.Sample site from Commerce 7.5 but I cannot see how and where the payment provider is invoked.
What am I missing?