Recruitment code is:

QY5XFN2R

How to register a friend code:
Create a Square Enix account
Log into your Mog Station
Go into the "Manage Service Option" tab
Enter the Recruitment Code (before paying for your 1st month!)
Enjoy this awesome game in time for Stormblood!

Bonus items:
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.
10 Silver Chocobo Feathers - Trade to the Calamity Salvager NPC for special items.