Codes can be redeemed in the PlayStation Store on the PS4 by doing the following:
- From the PS4 XMB (Dashboard) select "PlayStation Store"
- Once in the Store scroll down the menu on the left hand side of the screen to the very bottom and select "Redeem Code"
- Enter the 12 digit code and confirm
- Next time you boot up Warframe you'll be awarded the Platinum/Platinum Mods (depending on the pack)
NOTE: PC oriented codes will not work on a PS4 account and PS4 accounts will not work on a PC account.