Borderlands 2 SHiFT Codes
Borderlands 2 is the first Gearbox game to support the SHiFT System. Codes are periodically published that generally grant Gold Keys which can be used to access chests in Sanctuary. Sometimes codes are publishes to even grant skins and heads during community events.
The archive below is listed in reverse chronological order with the newest codes appearing first. You may also be interested in the active codes page that only contains functional SHiFT codes. Alternatively there is also a permanent codes index of SHiFT codes that never expire