The POS systems need this natively. So an order from any system is ingested the same as any other ticket typed by an employee on prem.

It needs to be a protocol like email or http, not another company with a proprietary aggregator.

I recently ordered a pickup order that seemed to just be using the restaurant's POS system.

For delivery it's harder because you actually need someone to deliver the food and the logistics are really hard (they have to get there when the food is ready but not too late and not too early, etc.). But... there are like 80 restaurants in a 10 minute walk radius from me, so I can just deal with pickup for now.