Each lock that Bay Area Locks sells includes a key authorization card that you can use to order additional keys in the future. This is the Medeco 5-pin M3 profile key, cut to match your existing Medeco locks. This is the 5-pin version of the M3 key, ensure your locks are 5-pin and not 6-pin. Refer to your Bay Area Locks invoice for complete clarification. The signed authorization card must be presented to me in person in order to obtain additional cut keys.
NOTE: The photo shows a G3 key, I will update this soon.