主权项 |
1. A method comprising:
receiving, at a service provider system, a message triggered by an application operating on a user device of a user; identifying a contact identifier corresponding to the user device from the message; transmitting a reply message that includes a token to the contact identifier; receiving a return token from the application that intercepted the reply message and extracted the token from the reply message without user intervention; and verifying, using a hardware processor, that the return token matches the token sent in the reply message, the verifying confirming that the contact identifier corresponds to the user device. |