The Cash dialog

Steps:

1. Pop up the cash dialog by hitting the Cash button on the checkout screen.
2. If customer offers exact amount, hit the Exact button. 
3. Otherwise, enter the amount is tendered, and the amount to be returned is computed (shown in green) and the cash drawer is opened. 
4. Now you can click the Submit button which will record the transaction. 

If you want the user to select a tip amount before asking for the cash, you have to show the tip dialog. From the Checkout screen, click the 'Tip Selector' button, shown before. A tip dialog will show up on the Customer side of the screen.

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