https://developer-community.sage.com/topic/5025-1-888486~3822how-can-i-speak-to-someone-at-expedia-faqs-expedia/

Partially refundable fares permit you to get a portion of your money back if you cancel the Flight. The Airline keeps the remainder as a service fee. In this case, Expedia will issue you a refund for the original purchase price minus the fee amount.