Collecting repair fees at the counter
At an authorised phone repair centre, out-of-warranty payments stalled at the counter. The flow we built: technician enters the amount, the customer gets a payment link by SMS, device status is checked online. Transactional SMS needs no marketing consent.
Pain: customers without cash left devices on the shelf; "what's the status" calls interrupted technicians.
Flow: ticket with warranty/paid split → info SMS with lookup link → amount entered → payment-link SMS → paid status flips automatically. Four-screen prototype live; real SMS/payment pending client sign-off.
Legal finding: status and payment-link SMS are transactional under Turkish rules — no IYS consent, only an approved sender ID (verify with your own counsel). Design lesson: v1 green was "playful"; v2 corporate navy as "the manufacturer's official service".