Both: the card updates itself
When a stamp or point is added, the platform updates the pass on the phone. The customer always sees the current balance without opening anything.
Apple Wallet: updates, not adverts
Apple's rules don't allow passes to be used for promotional push messages. A pass can show a message when certain fields change, but Stampaki doesn't use that for offers — on iPhone, a campaign updates the card silently.
Google Wallet: limited message notifications
Google Wallet supports messages on a pass, with notifications limited per pass per day. Stampaki caps notified messages at three per card per day and adds later ones silently.
Location relevance on both
A pass can carry up to 10 locations. The phone may surface it nearby, but the operating system decides when. No provider can guarantee a lock-screen appearance.
- Store coordinates only — not customer tracking
- Behaviour differs by platform and settings
What this means for your campaigns
Design offers to work even without a notification: visible on the card, applied at the counter, time-boxed. Treat any notification as a bonus, not the plan.