A method of completing a transaction for a UE includes: receiving, at roadside equipment, a position message indicating a position of the UE; receiving, at the roadside equipment, a transaction message from the UE, the transaction message being separate from the position message and including an encrypted token containing information associated with the UE to enable completion of the transaction; determining that the position message and the transaction message are cryptographically bound; decrypting the encrypted token to produce a decrypted token; determining a presence of the UE in a transaction region; and completing the transaction using the information contained in the decrypted token in response to determining that the position message and the transaction message are cryptographically bound and determining the presence of the UE in the transaction region.