20150206140 | CREDIT CARD TRANSACTION METHOD USING SMARTPHONE WITHOUT USING CREDIT CARD SALES SLIP - The present invention relates to a credit card transaction method using a smartphone without using a credit card sales slip, and the method comprises an authorization request step, a preliminary authorization transmitting step, a signing step, a signature transmitting step, a signature comparing step, and a slip transmitting step. More particularly, the present invention relates to a credit card transaction method in which credit card authorization information is transmitted to the smartphone of a user when the user uses a credit card, signature data is transmitted to a credit card company to obtain normal authorization when the user inputs a signature to the smartphone to which the authorization has been transmitted, and a slip is transmitted to the smartphone from the store in which the payment is being performed by the credit card, thus performing a normal credit card transaction without a paper credit card sales slip. | 07-23-2015 |