You won't be paid for orders that you choose to cancel. You will always be paid for orders that you prepare.
Even if the customer cancels the order or it never gets picked up by a delivery person, you will still receive a payment for that order on your weekly payment summary as long as Support verifies that you made the order.
You will not, however, be paid for unfulfilled orders in these instances: * Support confirms that the order was not prepared (for reasons such as you ran out of an item or the order was too big) * Your restaurant was closed when the delivery person arrived (for reasons such as closing early and forgetting to turn off your tablet or your hours are wrong on your menu and need to be updated)
If the order is cancelled by the customer, Support should give you a phone call to verify whether the order was prepared.