Section 1: Credit cards:

Firstly: The definition of credit cards.
A credit card is a document issued by the issuing bank to an individual or entity, i.e. the cardholder, based on an agreement between them which allows the user to buy commodities or services without immediate payment as there is guarantee by the issue for payment, and the payment is made by the account of the issuer, then it returns to the cardholder on a regular schedule, and some of these cards stipulate interest on the entire unpaid amount after a specific period from the payment due date, and some of them do not stipulate any interest.

Secondly: The Ruling on Using Debit Cards
It is permissible to issue and use debit cards if there is no interest associated with it as confirmed by the Islamic Fiqh Assembly under the Organisation of Islamic Cooperation, the Accounting and Auditing Organisation for Islamic Financial Institutions,  and the Jordanian Ifta Department.

This is because the following:
(1) There is no Islamic prohibition regarding this, and the default position is permissibility in matters of transactions.
(2) This is because the relationship between the card issuer and the cardholder is one of guarantorship, thus any money withdrawn is done immediately with no additional benefits.

Thirdly: The Ruling on Using Credit Cards
Issuing and dealing with credit cards is not permissible if they stipulate an increase in usurious interest, even if the cardholder intends to pay within the free grace period.
However, if the card does not include the condition of a usurious increase on the original debt, its issuance is permissible, as confirmed by the Islamic Fiqh Assembly under the Organisation of Islamic Cooperation, the Accounting and Auditing Organization for Islamic Financial Institutions, and the Jordanian Fatwa Authority, this is because the relationship between the card issuer and its holder is a relationship of guarantee for a fee, and a loan with usurious interest if there is a delay in payment; therefore, it is not permissible to charge a fee for this relationship.

Fourthly: Buying gold and silver with credit cards.
It is permissible to buy gold and silver with a secured credit card and is not permissible if the card is not secured.