Looks like vets must be sharing notes.
Did this a few days ago in the Indy area.
Same setup, call from parking lot, tech gets on the phone takes all the info, then comes out with his own slip fit leash and took our 1yr old (Willow) in.
Then Vet call when all was done with update on her infection, medicine and care plan. Vet then transferred us to the front desk, so we could pay over the phone.
Worked really well, even if it wasn't possible to quite practice social distancing with the tech during hand offs.