This isn't really that surprising considering the fact that the Metal Gear Online beta used the Konami ID. The official game appears to use them as well. To the left, you'll see a scan that tells you how to create a Konami ID or how to log in with one. What is the point of a PLAYSTATION Network ID for this game if we just have to sign up for another ID?

[So Guess what MGO uses Konami Game ID]