Are the salary and job permissible, knowing that the nature of the work is limited to inspecting the extent to which usurious and Islamic banks comply with the instructions of the monetary authority?

If the field of work is to supervise banks' compliance with the central bank's usury-based instructions, then it is not permissible, and the salary received is unlawful because it entails enforcing usurious dealings. The Prophet, peace and blessings be upon him, cursed: "The one who consumes usury, its दाता, its scribe, and its two witnesses," and he said: "They are all equal."

However, if the scope of work is limited to supervising banks concerning systems of currency issuance and replacing damaged and old currency with new, which has no connection to usurious transactions, then there is no harm in that.