When the customer enters a delivery address the cart:

1. Loads the address state; an unknown state stops the process.
2. Looks up zip-code entries for that state and kitchen that match the zip exactly, by prefix wildcard, or the * catch-all, preferring the entry whose Delivery Route runs on the weekday of the chosen delivery date.
3. If no matching entry is found, the customer sees <State>: Sorry, but we do not currently deliver to <zip>.
4. Checks that every module in the cart is ticked under Allow on for that zip; otherwise Unfortunately we cannot process your item "…" using the Delivery method.
5. Checks Cart: Delivery Amount Minimum Value – if not reached, You need to spend min of $X Per Delivery Order.

If the route is Uber Direct or Shippo, the carrier is asked to validate/quote the address first (see those sections).