2520 Remove `process_payments!` override #3653
A while ago we backported the Spree 2 version of
This pull request simplifies the subscriptions modification to work with Spree 2 code and removes some overrides.
What should we test?
I had troubles with payment methods in Katuma staging, but not is staging FR, so I guess this is good to go. Will stage something else to katuma staging to see if it was linked to the staging. https://docs.google.com/document/d/1x9OooII1jJc-8Zorfsst1u8WNeRqH9snejmS71YVeF4/edit#heading=h.hj26umg3kyxb