Give and redeem stamps at the till

Stamping happens at the till, with a queue behind. The whole flow is built around that: one screen, big buttons, nothing to read.

Panel Loyalty Scan

Two ways to identify the guest

1. 1
   Scan their code

   The guest opens the card on their phone and shows their code; your camera reads it. This is the normal path and it takes a second.

2. 2
   Or type the short code

   Under the code the phone shows a short number. Type it when the camera cannot see — a cracked screen, bright sun, a phone at 1% brightness.

Either way the screen then shows who they are and where their card stands: seven of nine, say, with the reward underneath.

Adding the stamp

One big button. The guest's phone updates immediately — they see the stamp land while they are still standing there, which is most of the reason the whole thing works.

Redeeming a reward

When a card fills, a reward is issued and the same screen offers to redeem it. Press it when you hand over the free coffee, not before: redeeming is what marks it used, and it cannot be used twice.

Why it sometimes refuses

A card cannot be stamped twice within a few minutes. It stops the accident where a second member of staff stamps the same guest again, and the deliberate version where a group of friends passes one phone around. If you see the message, the guest already has that stamp.

Who can stamp

Anyone on your team with access to the loyalty module at that location. Every stamp records who gave it and where, so the history answers questions rather than starting arguments.