This is not an issue of how to do it with the engine, but with the place the game is being sold at. For example Steam has its documentation for in-game purchases and systems at Steamworks. From the game, you just “activate” those when needed.
This is not an issue of how to do it with the engine, but with the place the game is being sold at. For example Steam has its documentation for in-game purchases and systems at Steamworks. From the game, you just “activate” those when needed.