To complete an order simply means taking payments to for a saved order: 

  1. Tap the draw icon on the top left side of the sales homepage to display a menu list. 

2. Find and tap Order to display a list of all saved orders. 

3. You can search for order using the Order ID or simply scroll down to find the order and tap on it to view the order details on the right side of the screen

4. On the Order details page, tap Charge at the bottom of the page. 

5. This will take you to the payment selection page to process payments.  
  How to process payment.

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