Duffel Duffel is an API that allows developers to build and sell flight booking experiences. Travel agencies, airlines, and other businesses use it to integrate flight search, booking, and management directly into their own platforms. Official docs: https://duffel.com/docs/ Duffel Overview - Offers - Airlines - Orders - Order Changes - Payments - Refunds - Cancellations - Airports - Aircraft - Currencies - Countries - Services - Seat Maps Working with Duffel This skill uses the Membrane CLI to interact with Duffel. Membrane handles authentication and credentials refresh automatically — so you…