There are only merch codes available for Pet Simulator 99! currently. It's also worth nothing you can only redeem codes when using a desktop. If you do have a merch code, follow these steps to redeem ...

Pet Simulator 99 is part of Roblox The Hunt: Mega Edition, and players must join the game to collect a "The Hunt Token". However, you must complete a specific quest that offers this token as a reward.