We have added a sandbox mode to the Game Manager for you to be able to test your game's Trail integration without affecting your user. The sandbox mode is turned on by default, and you can see that it's enabled by noticing the "sandbox"-overlay in the bottom-left corner when running your game.
Currently, the only Trail feature that is sandboxed, is the PaymentsKit. In the future, we will add more features to the sandbox mode. You can read more about how sandbox mode affects PaymentsKit in the Testing payments article.