I am engaged in the business of buying and selling cars. Generally, customers who want to purchase a car from me also wish that some institution (such as a bank) provide them with financing. For this purpose, after selecting the car, they arrange payment through the bank. I have no involvement with the bank or the institution that provides the financing, except that I receive the payment through them. Sometimes I may suggest a bank, or sometimes I am not involved in this discussion at all. In this situation, what is the ruling regarding my permission to conduct business in this manner?
If there is no other Shar‘i defect involved, then for the questioner, buying and selling cars in the mentioned manner is undoubtedly permissible and valid.