I can imagine 2 different approaches for this:
1. Have an external database of your characters, cars and levels and load them on demand (for example an AJAX call on a SQL Database).
2. Have full content added to your main game and unlock them in game if the DLC has been bought / activated.
hi, i have a little question about the second way if the game hasn't new content which is the DLC to unlock, how do i make this new content and update the game?
thanks your reply!