Validity of a contract where a Muslim appoints a non-Muslim as an agent (Wakil)?

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The appointment of an agent by a Muslim, where the agent is a non-Muslim (whether a Dhimmi, Musta'min, hostile combatant, or apostate), is valid for transactions in which the non-Muslim agent's actions are valid, such as buying and selling. This validity is established because the prerequisite of 'adl (probity/righteousness) and adherence to Islam are not conditions for the agency relationship.