Discover is the fourth-largest card issuer in the United States.
Apple Pay is a new NFC-based mobile payment service that arrives to U.S. customers in October. The service is exclusive to the iPhone 6 and iPhone 6 Plus. It allows users to pay for purchases with a simple tap.
The iPhone 6 and iPhone 6s can be preordered beginning Sept. 12. They arrive in stores on Sept. 19.