What is the ruling on my work as a pharmaceutical representative, informing my supervisor that doctors are requesting a percentage of money for prescribing medicine, and he then undertakes the agreement with them? And is the salary I receive lawful?

It is not permissible to direct the supervisor to the doctor who wants to take money in exchange for prescribing the company's medications, as long as this money is a forbidden bribe, for assisting in sin is not permissible. As for the salary from the company, it is permissible as long as the work is permissible and performed as required.