Credit according to Islamic finance should follow these principles:
Riba is prohibited: In Islamic finance, riba, meaning interest payments or interest-based loans, is forbidden. Therefore, there should be no hidden or additional interest in the credit system.
Price determination: Installment agreements allow payments over time, but these payments must be at an adjusted price. That is, instead of charging interest, the credit provider increases the price of the product or service to enable installment sales.
Fixed price and terms: In taking credit, the price and terms must be clear and transparent. Any changes from the agreed price, especially additional payments (interest), are not allowed.
Islamic fairness and honesty: The installment contract must be fair to both parties in Islamic finance. The contract should clearly define the relationships, responsibilities, and interests of both sides. Also, both parties must fairly share risks and profits.