Android GCM SENDER_ID, how to get it?

Question

I try to migrate to GCM and I have an issue with the SENDER_ID I need to provide. I use the demo project from google. In this project I need, if I

Answer 1

An updated answer as of Nov 2014 IF YOU'VE CREATED AN API PROJECT RECENTLY.

First of all, correct, you should absolutely go to the Google Developers Console and find the Project that you have GCM enabled on. When looking at the Overview section (left-hand nav panel), you'll see Project ID and Project Number listed on the right hand side. Project ID was failing for me (which is what led me here), but when I tried the Project Number, I'm able to register my clients correctly now.

Note that this is different because Google modified how they assign project IDs recently. In October I made a project and was given an all numerical Project ID, which I assume would work fine. But the one I created today was given a two-word and a number id (like Hamster-Party-420) and a numeric Project Number. The URL to my project contains Hamster-Party-420, and the Project Number is only visible on the Overview screen.