@michael_soprano when you sends payload to AEP using the Edge Network, the system often sends useful information back in return. However, just sending the event isn’t enough, you may need a way to listen for the response. Such as if you want to do something with that reply e.g like display a message after success response or view the response for some debugging, you need to set up a way to catch and use it. Send event complete helps you do that.
How to do that: Find Details on Send event complete HERE