Scope of agency when instructed to purchase an item using provided funds without specifying the method of purchase?

Primary text

When an agent is instructed to purchase a slave using specific dirhams given to them, the agent has the authority to execute the purchase either using those exact coins (as a specific item) or by incurring a debt obligation (in the agent's personal liability, *dhimma*). This is because the contract of purchase allows for both forms, and an unqualified authorization permits the agent to choose either method.