Pay the carrier
Paying the carrier means the balance goes to the company whose truck has the car, often at delivery. The broker may already have charged its own fee. The dispatch sheet should say who is owed what.
On a pay-the-carrier job, the driver or the carrier's office collects the freight charge. The usual moment is delivery, as COD, or when the carrier is assigned. The broker may already have collected a booking fee. Add the two numbers before you agree, so the cheap freight line is not hiding the fee.
What the receipt should show
The payee should be the carrier on the bill of lading, or the broker if the contract says the broker collects for the carrier. A personal name that matches neither is a stop. Get a receipt with the VIN and the amount. Inspect the car before you pay the balance. If the driver demands more than the contract, that is not the balance. That is a new price.
How it differs from paying the broker
Paying the broker means one company collects and then pays the truck. Paying the carrier means you are the one who settles with the truck. RideShipper is not in either chain. It does not take the freight charge and does not pay the driver.