| 摘要 |
In a method of administering an electronic commerce program, a unique identifier (218) is printed on a substrate (111) and the substrate (200) is issued to an end-user. An electronic communication (112), which includes a recitation of the unique identifier (218), is received from the end-user. A benefit due to the end-user is determined based on the unique identifier (218) and the benefit is conferred on the end-user. Upon receiving the electronic communication from the end-user, a record (110) of the unique identifier (218) is updated to show that the unique identifier (218) is no longer valid (124), thereby preventing reuse of the unique identifier (218). |
