主权项 |
1. A method comprising:
receiving, by a computer system of a service provider, information about a product selected by a buyer for purchasing at a later time, the product being offered by a vendor; in response to the receiving, generating, by the computer system of the service provider, a first token that identifies the product, the first token having an expiration time that is correlated with a price of the product; and transmitting, by the computer system of the service provider, the first token to a communication device of the buyer. |