The cash register number/name is a unique ID for the app (iPad). It is displayed on receipts and in the sales details of Back Office.
When you install the app on iPad, a register number is automatically assigned to that app.
If you uninstall and reinstall the app, then a new register number will be assigned to the app.
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How to check the register number
Select "Other" in the home screen.
The cash register number/name will be shown as below.
The cash register number is assigned to the App by default. However, you can set the name for it or change the number in Back Office.