An Affidavit of Service is proof of service, which is a notarized document you receive from your Arkansas process server upon completion of service. The Affidavit of Service in Arkansas describes who was served, when service took place, and where service occurred. The Affidavit of Service is crucial for all court cases—it starts the action and is proof that the legal papers have been served properly. It must be filed with the court to indicate that service has been made.