Interacting with a Shop

Once a shop has been established, any player can walk up to it and interact with it. Players interact by hitting or right-clicking the sign. The first time the shop is interacted with, the player is shown the information about the shop, and the second time causes a transaction. Punching the sign will cause the transaction to buy from the shop, while right-clicking the sign will sell to the shop. The owner of a shop can interact in the same way to deposit items from his/her inventory or withdraw them for no cost.