A client loyal to their injector follows that injector to a new clinic. A client loyal to the clinic stays when staff change, and refers friends to the practice, not the person. A loyalty programme is what builds the second kind.
Maria finishes a filler appointment and picks up her phone at the front desk. A text arrives: "You're 40 points from Gold." She taps it, and her loyalty card drops onto her lock screen, right next to her boarding pass and her Amex.
Three months later, a rebooking reminder lands on the same lock screen. She taps, picks a slot, done. No login, no app to open, no password to remember.
That's the interface. Nothing else for her to install, remember, or delete.