I was wondering about the controller of onepage checkout. Can anyone explain how the controller of onepage checkout works? Is it the one who explicitly calls the actions of payment modules for the frontend?
Also, what calls the Actions in the Controllers folder of my custom made payment module, e.g. successAction(), failAction()? Are these automatically called by the default controller of onepage checkout?
Finally, how can I redirect a successful transaction to a default success page of Magento and update the transaction order to success instead of pending? Or the the opposite reaction of error or rejection?
I appreciate any response. Thanks a lot!