Here are 4 un-used codes to use for RAF.

EB5BQ5YX
7NSGJ6W6
V29H4C4E
XU9M8ZGN

To use and recieve your rewards:

Log into the mogstation. Go to the Manage Service Options page
Click the Enter Recruitment Code button
Enter the code BEFORE you pay your first subscription, if you pay for a subscription before using the code it will not work
Once you are a subscribed member your rewards will be waiting for you ingame.

You get some nifty items just for typing a code in:

Friendship circlet - Increases all EXP gain by 20% until level 25
Ballroom Etiquette - A fistbump emote exclusive to RAF
99x Aetheryte tickets - You can quickly teleport all over Eorzea as you unlock them, but as a new player they will drain your gil fast. These tickets allow you to teleport for free 99x times. Use them wisely.
10x Silver Chocobo Feathers - These can be traded in for high level gear. (There is lvl 20 gear also but do not buy these)

I will update the codes if and when they are used.