CashRegisterAPI

Cash Register API

database:
	Items Table:
		* id INT (index)
		* price MONEY
		* name STRING (natural language index)
		* SKU INT
		* PPU MONEY
		* Taxable BOOL
	Transactions Table:
		* id INT (index)
		* timestamp TIME
		* open BOOL
	TransactionItemsJunction Table:
		* id INT
		* transactionId INT (index)
		* itemId INT

/setUp: Allows a cashier to initialize register with price list
/initialize @money @salesTax
	Allows the cashier to initialize register with given money amount and sales tax amount
/balance Gets the amount of balance in the register
/transact Creates a new transaction
/transactionAddItem @transactionId @itemId Adds item id to the current transaction
/viewTransaction @transactionId Views the transactions from id as well as subtotal
/closeTransaction @transactionId @money
	Amount of money recieved by customer. Change is calculated for the user