The listing, (PS4)Assassin's Creed Unity add-on Content has ended.
Instructions for code
1)Create an online account on your PSN-enabled Playstation® system, or use your existing account.
2)Select the PlayStation® Store icon on the PS4™ system Home Screen.
3)On PlayStation® Store, Select Redeem Codes at the bottom of the menu.
4)Enter the code. Please note that the code is case-sensitive and must be entered exactly as displayed
5) Once the code has been entered correctly, select Continue on the dialog box.
6)Select Download to start downloading the content,
7)Select Continue to complete code redemption