A delivery server may generate two separate security codes following a transaction between a user and a vendor, as well as a hash of the combination of the codes. The server may provide the first code to the user and the second code to the vendor, and provide the hash of a combination of the codes to both the vendor and the user. The user's vehicle may receive mapping information for the vendor's location, and may use the mapping information to autonomously navigate to an exchange station at the vendor location. At the exchange station, the vendor and vehicle may exchange security codes, and both vehicle and vendor may create a hash of the combined first code and second code, and use this to authenticate each other (by comparing this hash with the hash received from the delivery server). The vendor may then provide the goods to the vehicle, and the vehicle may automatically receive them and return them to the user.