If I buy from Domino's I pay the fixed price for my pizza + delivery fee + tip for the driver. If I buy food from $local_restaurant via $delivery_service I pay

If I buy from Domino's I pay the fixed price for my pizza + delivery fee + tip for the driver. If I buy food from $local_restaurant via $delivery_service I pay original cost of food + whatever the food deliver service adds to the cost of the food + the delivery services fee + tip to the restaurant + tip to the driver.