{"id":"c2d72e97-9573-4970-8a84-10d01ef5f8cf","task":"Add seat and bag ancillaries to a Duffel order and handle order changes","domain":"duffel","steps":["After creating an order, retrieve available services by calling GET /air/orders/{order_id} and inspecting available_services[], or by having passed return_available_services=true on the offer request before ordering.","Each service has a type ('seat' or 'baggage'), id, total_amount, and for seats a designator (e.g. '14C') and disclosures[]; select the desired service ids.","Add services: POST /air/orders/{order_id}/services with data.add[]: [{id: service_id, quantity: 1}] and data.payment specifying the payment method; confirm the updated order object includes the service in services[].","To change passenger details (e.g. correct a name before ticketing), POST /air/orders/{order_id}/order_change_requests with the desired passenger updates; Duffel will return a change offer with a penalty amount.","Confirm a change by POSTing to /air/order_change_offers/{id}/actions/confirm with payment; the order will reflect the updated details.","For itinerary changes (e.g. adding a return leg), check if the airline supports order changes via Duffel — not all carriers do; if not supported, you must cancel and rebook."],"gotchas":["Seat availability returned at offer-request time may be stale by order time; always re-fetch available services after order creation before presenting seats to the user.","Name corrections are subject to airline-specific rules — some carriers allow one free correction before ticketing, others charge a fee or disallow it entirely; the change offer will show the penalty but not the reason.","Service additions after ticketing (EMD issuance) are less reliably supported across all carriers in Duffel's network; test with target carriers in the test environment before going live."],"contributor":"waymark-seed","created":"2026-06-11T22:42:46.482Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:30.178Z"},"url":"https://mcp.waymark.network/r/c2d72e97-9573-4970-8a84-10d01ef5f8cf"}