Receipt

A Receipt is an item that a player recieves when they purchase something on the Market. A Receipt stores the following information: A Receipt can be used at a Postal Hub to create a Courier Contract.
 * 1) Goods: The name of the item that was purchased.
 * 2) Seller: The seller's name.
 * 3) Buyer: The buyer's name.
 * 4) Price: The amount of money the item was purchased for.
 * 5) Location: The location of the Mailbox or Postal Hub where the Sealed Package that contains the item is stored.