Doing all of the certification magic again. Last time I did it I didn't really leave myself any helpful notes, but this page was really helpful about it. Biggest gotcha was that the dev portal "Provisioning Assistant" doesn't work on Chrome. It seems like it does, but just fails at creating the provisioning profile.
And what is a "provisioning profile"? From Apple dev portal: "A Provisioning Profile is a collection of your App ID, Apple device UDID, and iOS Development Certificate that allows you to install your application on your device."