How to find the game-id of a ps4 game?

In Home-Assistant go to states under developer tools. Then find your ps4 media player in the list. In the second column it will show the media_content_id this is the Game ID you need when linking an image.

Which image url should i add?

You can add any url of an image to the database. But please keep in mind that:

• It’s best to use images which are at least 700 x 350 pixels. Higher is always good.
• You can always check the database for working examples.