What add ons do you feel are most important for the machines?

What add ons do you feel are most important for the machines? Such as an ID scanner and a pouch lifter? How soon do these things come back into stock? Also I am located in Arizona and have gotten mixed answers on whether or not I can sell things such as Zyn pouches out of a vape vending machine. Please let me know what you think as I am brand new to this and it would be my first every business.

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