In the brief 15-second clip, called "Pay with a message," the main character from Fly Market takes a glance at his friend's pocket square and appears to like it. Using the Apple Pay Cash app within iMessage on iPhone X, he texts his friend $17 and then the pocket square disappears from his friend's jacket and transfers into his own.
Similar to a regular Apple Pay purchase on iPhone X, Apple Pay Cash uses Face ID to confirm the user's identity before sending the money to a friend or family member. Apple Pay Cash wasn't ready at the launch of the iPhone X in early November, but instead began rolling out to users in iOS 11.2 around the beginning of December.
Prior to "Fly Market," Apple's last Face ID-focused video was called "Unlock." In it, a woman discovered that unlocking her iPhone caused everything in the surrounding area to unlock, including lockers, cabinets, doors, and more.