What is the ruling on dealing with bank guarantees or letters of credit, the value of which is paid after a period for a commission, given the unavailability of Islamic banks?

This bank guarantee is either a letter of guarantee, the ruling for which has been provided, or a letter of credit. A letter of credit is a financial facility provided by banks to their importing clients to open credits on behalf of exporters. It is considered an agency if the client finances it independently and the bank's role is that of an agent for a known fee. However, if the client does not own the value of the credit or has less than the required amount, it becomes a loan from the bank with prohibited usurious interest. The sin of the loan is tied to the borrower, and there is no blame on others for owning this money or transacting with it.