If you're a Dasher, you should have enough change on hand for the delivery if it is paid for in cash. Both you and the customer benefit from it. You shouldn't rely on the hope that the customer will leave a tip if you don't have exact change. Conversely, it can also happen the other way around. It is possible that the customer does not have enough cash to pay for the order. Dashers will have to return the order to the restaurant if they cannot receive the order. Half of the guaranteed minimum amount is then paid to the Dasher.