Is it permissible to pay a percentage of compensation to someone who mediates to restore a right, knowing that this right was usurped by the state?

It is permissible, according to Islamic law, to seek compensation for land, and it is permissible to give a specific amount or a percentage of the compensation to the person who undertakes this task, whether they are a relative or an official. This falls under the category of ju'alah (commission/reward) or wakalah bi ajr (agency for a fee). Some jurists have permitted the ju'l (reward) to be a percentage or a common share of the wealth, likening it to mudarabah (profit-sharing partnership), and this is the view of the Hanbalis.