Unturned Shop commands are:
/sell <ID or name>: sell something from your inventory to the server shop
/buy <ID or name>: buy something from the server shop
/buy v.<ID or name>: buy a vehicle (car, boat, plane and such)
/cost <ID or name>: ask for buying and selling price for an item from the server shop
/balance : Show your delicious amount of Bananas!!
/pay player <amount> : pay amount to player
/exchange <amount>/money : exchange amount of bananas for XP (exchange rate is 0.5)
/exchange <amount> : exchange amount of XP for Bananas (exchange rate is 0.5)