What is the ruling on taking money in exchange for currency exchange for another person when the state prohibits it, and what is the ruling on taking money for intermediation in that?

The ruler may restrict permissible matters in a way that aligns with the public good, and obedience to him in such cases is obligatory. Therefore, it is not permissible to circumvent a system established to uphold the public interest, and compliance with it is mandatory. If the exemption of a traveler from currency exchange restrictions is for personal benefit, then the traveler may not trade with this right or make it a means of profit. He may only exchange currency for himself in a manner consistent with the system established for the public interest. Consequently, the amount paid by the merchant to the traveler is neither permissible to give nor to receive, and assisting in this act, whether for payment or without, is not permissible.