Genuinely, you would not order something unless you had the money or credit to pay for it and wanted it. This can be pre-approved on the card or couriers could carry a mobile card machine.
Couriers would be unemployed unless they took payment and forwarded it most likely electronically.
A quick glimpse would prove that you got what you ordered, with a scam you pay and get nothing.
Supermarkets and restaurants presently operate this system and have no problems.
Scammers would be eliminated instantly as they would get nothing.