Pre-authorization is a room setting, not a site setting. Configure the room where the tabs are actually run, usually the bar.

Set the pre-auth amounts

1. In the Admin Portal Main Menu, click Location Setup then Rooms.
2. Select the room that will use pre-authorized tabs.
3. In Pre-Auth Amount, enter the initial authorization, for example $10. Set this at roughly the site average check.
4. In Additional Auth Increment Amount, enter the top up amount, for example $5.
5. Click Save.

Worked example: a $10 pre-auth with a $5 increment authorizes $10 when the tab opens. When the ticket passes $10 the POS authorizes another $5, taking the tab ceiling to $15, and so on.

Set a tip threshold warning

This makes the POS warn staff when a tip is unusually large as a share of the check.

1. In the Admin Portal Main Menu, click Location Setup.
2. Open the Transaction Settings tab.
3. Enter a percentage in Tip Threshold Warning Percentage. Use the tip overage percentage defined by the site card processor.
4. Click Save.

Leave the box empty and the POS shows no tip threshold alerts at all.

Source: Global Payments Bar Tabs User Guide for Mobile 2.0 and NextGen.