It should be in the form of staple food, given to the poor. Using a credit card to buy it is permissible but the problem is in the interest that might occur if you don’t pay on time which is a major sin.

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Most conventional banks have regular checking accounts where you do not earn interest, with a debit card. If that is not available and there is only a type of savings account where interest is earned on your money, then you must give the interest money to charity to cleanse your wealth.

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Setting up this type of agreement with a conventional riba based bank is not permissible. What you mentioned is clear riba as well.

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