If you are curious enough to want to build your own push notification backend system, then you will come to a point in time when you need to get the certificates for your server to communicate with the Apple APNS server. When you start searching the web for tutorials on this subject you will find lots of out of date material showing screen shots from previous versions of iTunes Connect, Xcode or the Key-Chain software.
As of right now the only accurate account I have found is this Excellent Stack Overflow post.
Hope that helps save someone some time.
