What is the ruling on the money demanded by an employee to finalize the paperwork for obtaining a graduation certificate?

It is not permissible for an employee to request anything from students in exchange for their official work for which they receive a salary, even if their request is not directly in exchange for their work, but rather an exploitation of their position. The jurisprudential rule is: "That which is forbidden to take is forbidden to give," because giving something forbidden to another is considered an invitation to it or an aid in it, making the giver a partner to the doer. And since the completion of the transaction does not depend on the payment of money, the payer has no excuse for cooperating in sin.