This will be a demonstration of how to insert links inside of emails where you don’t want to pass private IDs. Instead of private IDs, will be sent a GUID that will be inside of the link that will redirect to a screen on the application that will receive an input parameter, the GUID. 

The Use case that I am using is one where the user will get an account and will receive an email getting a welcome notice, then he will have a link where it will go to a screen to update his details. Maybe this is not the best use case, but it's a way of showing how to implement the logic where we send an email with GUID attached to a link.