Oregon Certificate of Service is a document used to prove that legal documents have been served or delivered to the appropriate person within the state of Oregon. There are two types of Oregon Certificate of Service: Certificate of Service by Mail and Certificate of Service by Personal Delivery. Certificate of Service by Mail is used to prove that documents were sent by mail, while Certificate of Service by Personal Delivery is used to prove that documents were physically delivered to the recipient. Both types of Certificate of Service must include the name and address of the person served, the date of service, the method of service, and the signature of the server. Oregon Certificate of Service provides proof of service and is required in order to proceed to the next step in the legal process.