Recruitment Code: RWSN3NUP
Recruitment Code: 8RQVARJM

You can register a 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 Option"
4. Last but not least, entering the Recruitment Code: 4PWHYE4Q (BEFORE YOU PURCHASE YOUR SUBSCRIPTION!)

Bonus items are:

Friendship Circlet - Increases EXP earned by 20% when level 25 and below.
Aetheryte Ticket x 99 - Good for 99 free teleports!
Ballroom Etiquette - Improper Greetings: Using this will unlock a new emote.
10 Silver Chocobo Feathers - Trade in to the Calamity Salvager NPC for special items. The Calamity Salvager NPC can be found in Limsa Lominsa, Gridania, and Uldah (starting cities).