Process after IPN is received

I need to activate a user if a transaction is successful. What event should I listen after an IPN is received using Payum Bundle?

Payum\Bundle\PayumBundle\Controller\NotifyController::doAction doesn't seem to dispatch any event. How is this controller useful?

After some experiments and reading more source code, I found out that we could implement desired behaviours (send email, update database) as actions and tag it with payum.action or simply add it to the targeted Payum context.

• Documentation
• Implementation Example
• Configuration per Payum context

Configuration per action

services:
    acme.sample_action:
        class: Acme\PaymemtBundle\Payum\Action\SampleAction
        tags:
            - { name: payum.action, factory: paypal_express_checkout_nvp }