All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad, is His slave and Messenger.
It is impermissible to use credit cards that stipulate Riba-based conditions like imposing interest charges on delayed payments. You should not have helped your roommate obtain that card, even if he insistently urged you to do so because of the general prohibition of cooperation in sin. Allah, The Exalted, Says (what means): {And cooperate in righteousness and piety, but do not cooperate in sin and aggression.} [Quran: 5:2]
You should seek the forgiveness of Allah and not repeat this in the future, and do not receive the card on his behalf.
Allah Knows best.