What is the legitimate Islamic ruling regarding (Sh.) joining as a partner in a company that sells optical glasses – with a symbolic contribution from him without him receiving profits – utilizing his certification, knowing that the major shareholder may deal with usury or other forbidden transactions, and is it obligatory for him to stipulate the company's adherence to Sharia and to research and investigate its transactions?

If the competent authorities stipulate a specialized certificate to open an optical shop, then this condition must be adhered to for the benefit of the people and to avoid deception and fraud.

The legitimate method is for the certificate holder to work in the shop for a known wage, not by leasing their certificate.

There is no blame on the hired certificate holder if the employer engages in usurious transactions, unless these transactions are done in their name or they assist in them. In such a case, it becomes unlawful for them to allow the use of their name and certificate.

The certificate holder may also stipulate adherence to Islamic legal guidelines in transactions.