Codes:
(3/4 Available, not sure which has been used!)
ZVWMD2VF
HDWYEMKB
QCR87RER
83EHHXZG

You can register the code by
1. Creating a Square Enix account
2. Logging into your Mog Station here -> http://sqex.to/Msp
3. Going to the tab "Manage Service Options"
4. Enter your Recruitment Code - before you purchase your first 30 days!

Bonus items are:
Friendship Circlet Increases EXP earned by 20% when level 25 and below.
Aetheryte Ticket x 99 Players in possession of an aetheryte ticket when using Teleport will not incur a gil fee.
Ballroom Etiquette - Improper Greetings: Using this will unlock a new emote. Fist Bump (/fistbump, /brofist)
10 Silver Chocobo Feathers Trade to the Calamity Salvager NPC for special items. The Calamity Salvager NPC can be found in Limsa Lominsa, Gridania