Following any Fixter service, your service book will be stamped by the garage and delivered back to you along with your car.
Many service books are now also available online - but please note, online service records are updated subject to data and tooling availability. (Some manufacturers like BMW and Mercedes-Benz's Digital Service Sheets have proprietary systems, which many garages do not have access to) In addition, you will always receive an itemised receipt with proof of service by email.