والعامل: يدفع إليه الإمام بقدر عمله إن عمل
Translation: The imam gives the authorised collector according to his work, provided he actually performs it.
The ʿāmil is an officially assigned zakat worker, not merely anyone who volunteers to carry an envelope of money.
The words “if he works” make the appointment and performance of duties relevant; the payment is connected to the work.