Alright guys, Here's how you redeem your Rockstar Promotions. (Noted: Amount of engrams depend on the prized you got from the redemption codes)
First go to : https://www.bungie.net/redeemedcodes
Make sure you are logged in.
Underneath that site/url, you will see the botton "Redeem" next to your coordinating amount of engrams to claim.
It will then ask you which platform/system you would like to claim it on. Obviously, you choose PS4/XBOX1.
Once this is done, your engrams should be in your in-game mail.
The Engrams differs, it could be any armor/weapon dependent on your Light Level.
If it were me after finding this out...I would claim these Engrams once you're max level to maximize Light Level.
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All that's showing up is all of the things I've redeemed in Destiny 1. I click the redeem button at the bottom and it asks for a 9-digit code.