New York Certificate of service is a document that provides proof of service of process in New York State. It is issued by a process server or sheriff after service of process is complete. The certificate can be used in court proceedings to prove that a summons, complaint, or other legal documents were properly served. There are two types of New York Certificate of service: an Affidavit of Service and an Affidavit of Personal Service. An Affidavit of Service is a sworn statement from the process server or sheriff detailing the date, time, and manner of service, and is usually filed with the court. An Affidavit of Personal Service is a sworn statement from the process server or sheriff that states that service was made by personally delivering the documents to the defendant or a person of suitable age and discretion at the defendant’s residence.