Backend for a loyalty accounting system for a restaurant chain

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Link to original post in RU

Task
A restaurant chain needs a loyalty points accounting system with integration with Rkeeper, Whatsapp, and Apple Wallet.

• Ability to create a new member card for the loyalty system: by a waiter through the cash register or by the customer themselves via Whatsapp.
• Ability to accrue and redeem (with confirmation) points: by a waiter through the cash register or by the customer themselves via Whatsapp.
• Ability to check the current account balance: by a waiter through the cash register or by the customer themselves via Whatsapp.
• Data migration from the previously used loyalty system.

Result
QR codes are printed on the tables, scanning them opens Whatsapp on the phone, and the customer sends a message to the loyalty system number.
The loyalty system checks if the number is present in the database; if it exists, the current balance is returned; if it's a new number, the customer receives a link to their created card in Apple Wallet with a welcome bonus balance.
At the cash register, the waiter can enter the phone number to check the current balance or create a new card if the number is not in the database.
To deduct points from the customer's account, the waiter must enter a temporary code from the Apple Wallet card, thus preventing abuse by the waitstaff.
The Totum database operates a backend data visualization system for the loyalty system.

Translated by GPTChat