Subscribe App to Push Notifications

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Is there a way to subscribe an application to receive Canvas push notifications on behalf of a user?

I am reading Canvas API's "Communication Channels" but it isn't super clear to me the process for registering my app to receive notifications.

https://canvas.instructure.com/doc/api/communication_channels.html#CommunicationChannel

As an example, I queried my own channels (as a student at an institution) and got my email, and a Channel object set to "For All Devices".

I would be using the Apple/iOS Push Notification services to do this, and I'd prefer for obvious reasons for any solution to comply with Apple's policies for sending notifications to a device.