Instant Payment Notifications from 3rd party platform

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I'm writing a custom payment plugin for Shopify. The flow is pretty much what you'd expect. Client reaches checkout, gets redirected to the 3rd party platform, enters his credit card info, finishes the transaction then gets redirect back to the shopify platform.


The 3rd party platform in question will also send out a IPN(several actually) when the payment is authorized and the order is marked as complete.


I can't seem to find anything in the docs regarding how I can receive the IPN in shopify(or in the plugin I'm developing). Is that even possible? 

Since I'm fairly certain some form of documentation on this exists and I just missed it, a simple link with the docs is fine by me.