FAQ Q107: What is the IPN call?
IPN (instant payment notification) is a server to server HTTP call which Bitvolo makes in order to inform your shopping cart website of the status of the transaction. This allows your shopping cart website to do automatic processing of the order, e.g. ship the products / send out confirmation emails etc.
We have existing integrations which handle all aspects of the transaction processing, including making the IPN call but if you do a custom integration (Javascript or API), you'll need to do the implementation of the IPN call (webhook) yourself.