Hey Rosstheboss!
Jonathan with the Zapiet team, we have an API integration through app Store Pickup and Delivery that has integrations with DoorDash, Roadie and a few other last mile couriers. You can learn more information here https://www.zapiet.com/partners/last-mile-delivery - if you’d like to set up a meeting, I can definitely answer some questions, feel free to reach out to me at jonathan@zapiet.com.