This form is filed with the Court after the service is done. This form is called an Affidavit of Service.An affidavit of service, also sometimes called a proof of service affidavit, is a type of affidavit that relates to legal documents that are filed with a court. An affidavit for service is a legal document confirming the delivery of court papers to a party involved in a legal proceeding. Fill Out an Affidavit. An affidavit is a written statement of facts that is made under oath and is used as evidence in court. A person who wants to be authorized to serve citations and other notices may file a written affidavit as an application. "Service" means notifying the other party that you filed a document in the case. Serve Notice on the other Party.