What is Due Amount Gratuity?
Gratuity is called guests tip for your staff.
Customer says that “Keep the change” offer gratuity in terms of due amount.
Example: Restaurant Bill is 2281 and customer paid 2500 so request to keep change – 219
Location:
eZee Burrp >> Take order (Dine-in, Take away, Delivery) >> Settlement
How to access:
Please check below screenshot to calculate automatic gratuity
Screenshot 1: 
Screenshot 2: Gratuity Report.