US Patent 7685020 Mobile commerce receipt system

A mobile commerce receipt system and method providing a user of a mobile telecommunications terminal with a reliable electronic proof of reservation, purchase and/or payment made. By e-commerce means, the user places an order with a vendor or merchant and makes electronic payment. The vendor issues an electronic contract, sending the contract to a Trusted Third Party (TTP) receipt server. The TTP validates the contract, generates an electronic, digital receipt which is to sent the vendor. The vendor sends the receipt to the mobile terminal of the user, the mobile terminal storing the receipt for subsequent presentation at the point of delivery of the ordered goods or services.