| 摘要 |
A method comprises a step of obtaining an identification code of a product, a step of receiving a physical location of the product from a buyer, a step of noting geographical locations seller(s) of the product in the vicinity of the physical location of the product, a step of comparing the geographical location with the physical location, and a step of recording a sales transaction of the product if the geographical location is away from the physical location more than a predetermined distance. |
