Working without internet

The app keeps data on the device too, so a short outage does not stop the till.

What works offline

• The product catalogue and prices, from local storage.
• Building a basket and totalling it.
• Shop data loaded earlier.

What needs a connection

• Checking a customer card and crediting points.
• Redeeming coupons.
• Game results.

These run on the server so that the same coupon cannot be used at two tills.

Syncing

When the connection returns, the app refreshes by itself. You can also start a sync manually in Settings. After a longer break it is worth doing before a shift, so the catalogue and coupons are current.

What not to do

Do not repeat a transaction because the screen seemed to freeze — check the purchase history first. Often the operation already went through, and repeating it would deduct points twice.