What the cashier says at the counter is the programme.
Choose your programme, grow your shop
Web, iPhone and iPad, Android
What your cashier says at the counter IS the programme. A perfectly configured programme nobody mentions gathers not one member.
The sentence
One sentence, before they say the total: «are you on our card?». Before the total, because after paying a customer's mind has already left the shop.
And for whoever says no: «scan the code on the table, you are in within a second, and the sixth is on us». Two sentences and done. No explanation and no form. (Web)
The scan
A scan READS first and shows the card; nothing is written until «Record». Train them to read the screen before pressing. The balance and the ready prizes are right there.
A refusal
When the system refuses, the reason is on the screen. Train them to read it out to the customer instead of saying «the system is down».
A prize
Train them to hand it over with a smile and no inspection. The balance is on their screen, and one scan answers in a second.