GLOBAL
--(101) Invalid Missing Argument
USERS
-- /:userId
----(401) User Not Found
----(402) Invalid User Id
----(404) User Already Found
----(400) Server Error
----(200) DONE
-- /
----(400) Server Error
----(200) DONE
CODES
-- /redeem
----(401) (User/Code) Not Found type: User|Code
----(500) (User) Already Redeemed
----(501) Code Reached The Limit
----(200) DONE
-- /
----(404) Code Already Found
----(400) Server Error
----(200) DONE