The marketplace I am building needs to be notified when a payment completes so that automated delivery would kick in. So far I found IPNs and webhooks and both do very similar things. I was wondering, what is the difference between the two, and when should I pick which? Also, with IPNs they explicitly state that I should initiate my delivery procedure when I receive IPN with status `completed`, it is much less clearer what events should I listen in webhooks. Thanks for help.
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