# GDS Exchanges

GDS ticket exchange workflow from exchange search, modify, and ticket exchange.

 - [GET /eligibility/ticketchangeeligibilities](https://developer.travelport.com/apis/flights/gds-exchanges/geteligibility.md): The Eligibility API is the first step in the GDS exchange workflow. It is an optional step. Eligibility returns information about whether a ticket may have value in an exchange or refund scenario, a
 - [POST /exchangesearch/catalogofferingsairchange](https://developer.travelport.com/apis/flights/gds-exchanges/createexchangesearch.md): The Exchange Search API is the second step in the GDS exchange workflow, after Eligibility. It supports searching for an alternate itinerary for a possible exchange on a currently ticketed GDS itinera
 - [POST /air/book/reservation/reservations/{Identifier}](https://developer.travelport.com/apis/flights/gds-exchanges/commitreservation.md): After all required and any optional steps in a booking workbench session, send a POST request with the workbench identifier to commit the workbench. Depending on the requests sent in the workbench s
 - [POST /air/receipt/receipts/documentrefundfromofferlist](https://developer.travelport.com/apis/flights/gds-exchanges/refundfromofferlist.md): Issues the refund based on a previously generated refund quote. Reference the OfferListIdentifiers returned in Document Refun Quote to select the refund you wish to complete.
 - [POST /air/book/airoffer/offers/documentrefundquote](https://developer.travelport.com/apis/flights/gds-exchanges/documentrefundquote.md): Send one or more ticket numbers for a Refund Quote to determine what, if any, refund value may be available on the ticket(s). You can send multiple tickets only if all tickets sent in the request belo
 - [POST /air/book/offer/reservationworkbench/{ReservationResource_Identifier}/offers/buildfromcatalogofferings](https://developer.travelport.com/apis/flights/gds-exchanges/tripchangebuildfromcatalogofferings.md): Use the Add Offer reference payload request to add an offer to the reservation workbench as part of the booking workflow. The reference payload request sends identifiers from the Exchange Search respo
 - [POST /air/payment/reservationworkbench/{ReservationResource_Identifier}/formofpayment](https://developer.travelport.com/apis/flights/gds-exchanges/addformofpayment.md): You can send an Add Form of Payment (FOP) request in either a booking or ticketing workbench session. FOPs of cash and credit are supported. FOPs of agent invoice and non-standard credit card are supp
 - [POST /air/paymentoffer/reservationworkbench/{ReservationResource_Identifier}/payments](https://developer.travelport.com/apis/flights/gds-exchanges/addpayment.md): The Payment step takes place in a ticketing workbench session and applies the payment sent previously in the Form of Payment request to the offer/s specified in the Payment request payload. Payment ca