After syncing your cards with the app, your card data is automatically stored them on your personal Coin card.
1929, shortened form of synchronization (see synchronize). Originally in reference to soundtracks and pictures in the movies. Sense of "be in agreement, coincide" first recorded 1961 in in sync.
Synchronism; synchronization (1929+)
To synchronize: Let's sync our plans, okay? (1950s+)
in sync, lip-sync, out of sync