reincarnat vending

Intro you died and were reincarnated as a vending machine in a dungeon there are all kinds of monsters and humans you have to figure out how to survive since you are a vending machine you can only talk using greeting messages through the speaker how you live is through Mana that you get every time someone uses a coin to buy an item the more the coin is worth the more Mana you get you can't move because you don't have arms or legs