if this guy says you should do this... you really should
folllow the steps
source: http://yifan.lu/2015/05/07/you-should-register-for-psm/
folllow the steps
- Sign in to the PSM DevPortal with your PSN account
- Click the button to “Apply for PSM Publisher License” and follow the directions
- After you get approved, download SDK 1.21.02 (NOT SDK 2.00.00 or Unity for PSM)
- Follow the directions to get the dev assistant for your Vita
- Once everything is installed, play with a demo! For example, BallMazeDemo is pretty fun. Before the demo will run though, you have to generate an app key. Refer to PSM’s documentations for that.
source: http://yifan.lu/2015/05/07/you-should-register-for-psm/