Answer:
(Fatwa: 223/46=TL/1430)
The ruling of credit card is that if the due amount is paid back before due date without being liable for interest, then it is lawful. If the amount is repaid beyond due date with interest then it is unlawful. Therefore, the first case mentioned in the question is lawful and the other two are unlawful. As far as the extra cash on purchasing is concerned, it is interest which is haram and unlawful by Shariah, you are not allowed to use it.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
