Add bags & extras (XML)

Ancillary services (a checked bag here) can be bought at two moments, with the same mechanics — ServiceList returns priced service offer items, and the chosen item is referenced in the committing call:

On an existing order — ServiceList with an OrderRequest, then OrderChange (below).
During the initial booking — ServiceList with an OfferRequest against the priced offer, then include the item in OrderCreate (further down).

The order flow continues from Make a test booking — you need a confirmed order and a valid token. Examples were captured live on v21.3; v25.4 is identical apart from the URL segment and the response <VersionNumber>.

Step 1 — ServiceList — list the available services

POST /ndc/v21.3/ServiceList

Same shape as SeatAvailability — for an existing order, ServiceListCoreRequest takes an OrderRequest:

IATA_ServiceListRQ
<?xml version="1.0" encoding="UTF-8"?>
<IATA_ServiceListRQ xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersMessage">
  <DistributionChain>
    <DistributionChainLink xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <Ordinal>1</Ordinal>
      <OrgRole>Seller</OrgRole>
      <ParticipatingOrg>
        <OrgID>BZ</OrgID>
      </ParticipatingOrg>
    </DistributionChainLink>
    <DistributionChainLink xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <Ordinal>2</Ordinal>
      <OrgRole>Carrier</OrgRole>
      <ParticipatingOrg>
        <OrgID>MX</OrgID>
      </ParticipatingOrg>
    </DistributionChainLink>
  </DistributionChain>
  <Request>
    <Pax xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <PaxID>ADT-1</PaxID>
      <PTC>ADT</PTC>
    </Pax>
    <ServiceListCoreRequest xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <OrderRequest>
        <Order>
          <OrderID>MXYTG780SE6I</OrderID>
          <OwnerCode>MX</OwnerCode>
        </Order>
      </OrderRequest>
    </ServiceListCoreRequest>
  </Request>
</IATA_ServiceListRQ>

The response's ALaCarteOffer lists one OfferItem per service, passenger, and journey/segment (OFI-SR- prefix), each priced via UnitPrice. DataLists.ServiceDefinitionList names each service — ServiceCode is the SSR code:

IATA_ServiceListRS — 200 OK (trimmed to the first checked bag)
<?xml version="1.0" encoding="UTF-8"?>
<IATA_ServiceListRS xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersMessage">
  <Response>
    <ALaCarteOffer xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <OfferID>ALC-SR-T1J8TVhZVEc3ODBTRTZJ</OfferID>
      <OfferItem>
        <Eligibility>
          <OfferFlightAssociations>
            <PaxJourneyRef>
              <PaxJourneyRefID>JOU-UFZVU05BfDIwMjYwOTE1fE1YMTY0NA</PaxJourneyRefID>
            </PaxJourneyRef>
          </OfferFlightAssociations>
          <PaxRefID>ADT-1</PaxRefID>
        </Eligibility>
        <OfferItemID>OFI-SR-SnwxfFBWVVNOQXwyMDI2MDkxNXxNWDE2NDR8QmFnZ2FnZXxBRFQtMXxDQjE</OfferItemID>
        <Service>
          <ServiceDefinitionRefID>SD-SR-SnwxfFBWVVNOQXwyMDI2MDkxNXxNWDE2NDR8QmFnZ2FnZXxDQjE</ServiceDefinitionRefID>
          <ServiceID>SVC-SR-SnwxfFBWVVNOQXwyMDI2MDkxNXxNWDE2NDR8QmFnZ2FnZXxBRFQtMXxDQjE</ServiceID>
        </Service>
        <UnitPrice>
          <TotalAmount CurCode="USD">35.00</TotalAmount>
        </UnitPrice>
      </OfferItem>
      <!-- CB2, CB3, carry-on, Wi-Fi, priority boarding, wheelchair SSRs, … elided -->
    </ALaCarteOffer>
    <DataLists xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <ServiceDefinitionList>
        <ServiceDefinition>
          <Name>Checked Bag 1</Name>
          <OwnerCode>MX</OwnerCode>
          <ServiceCode>CB1</ServiceCode>
          <ServiceDefinitionAssociation>
            <BaggageAllowanceRef>
              <BaggageAllowanceRefID>BAG-Q0Ix</BaggageAllowanceRefID>
            </BaggageAllowanceRef>
          </ServiceDefinitionAssociation>
          <ServiceDefinitionID>SD-SR-SnwxfFBWVVNOQXwyMDI2MDkxNXxNWDE2NDR8QmFnZ2FnZXxDQjE</ServiceDefinitionID>
        </ServiceDefinition>
        <!-- remaining service definitions and BaggageAllowanceList elided -->
      </ServiceDefinitionList>
    </DataLists>
  </Response>
  <PayloadAttributes>
    <Timestamp xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">2026-08-17T15:28:35.118Z</Timestamp>
    <VersionNumber xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">21.3</VersionNumber>
  </PayloadAttributes>
</IATA_ServiceListRS>

We'll buy the first checked bag, CB1 at $35.

Bags are a ladder

Checked bags are tiered per passenger per journey: CB1 is the first bag, CB2 the second, CB3 the third. Buy them in order — accepting CB2 while the passenger holds no CB1 on that journey is rejected.

Step 2 — OrderChange — accept the service offer

POST /ndc/v21.3/OrderChange

Same AcceptSelectedQuotedOfferList as a seat, without SelectedSeat:

IATA_OrderChangeRQ
<?xml version="1.0" encoding="UTF-8"?>
<IATA_OrderChangeRQ xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersMessage">
  <DistributionChain>
    <DistributionChainLink xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <Ordinal>1</Ordinal>
      <OrgRole>Seller</OrgRole>
      <ParticipatingOrg>
        <OrgID>BZ</OrgID>
      </ParticipatingOrg>
    </DistributionChainLink>
    <DistributionChainLink xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <Ordinal>2</Ordinal>
      <OrgRole>Carrier</OrgRole>
      <ParticipatingOrg>
        <OrgID>MX</OrgID>
      </ParticipatingOrg>
    </DistributionChainLink>
  </DistributionChain>
  <Request>
    <ChangeOrderChoice xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <AcceptSelectedQuotedOfferList>
        <SelectedPricedOffer>
          <OfferRefID>ALC-SR-T1J8TVhZVEc3ODBTRTZJ</OfferRefID>
          <SelectedOfferItem>
            <OfferItemRefID>OFI-SR-SnwxfFBWVVNOQXwyMDI2MDkxNXxNWDE2NDR8QmFnZ2FnZXxBRFQtMXxDQjE</OfferItemRefID>
            <PaxRefID>ADT-1</PaxRefID>
          </SelectedOfferItem>
        </SelectedPricedOffer>
      </AcceptSelectedQuotedOfferList>
    </ChangeOrderChoice>
    <Order xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <OrderID>MXYTG780SE6I</OrderID>
      <OwnerCode>MX</OwnerCode>
    </Order>
    <PaymentFunctions xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <PaymentProcessingDetails>
        <Amount CurCode="USD">35.00</Amount>
        <Payer>
          <PayerName>
            <IndividualName>
              <GivenName>John</GivenName>
              <Surname>Doe</Surname>
            </IndividualName>
          </PayerName>
          <PaymentAddress>
            <PostalAddress>
              <CityName>Los Angeles</CityName>
              <CountryCode>US</CountryCode>
              <CountrySubDivisionName>California</CountrySubDivisionName>
              <PostalCode>90210</PostalCode>
              <StreetText>123 Main St</StreetText>
            </PostalAddress>
          </PaymentAddress>
        </Payer>
        <PaymentMethod>
          <PaymentCard>
            <CardBrandCode>VI</CardBrandCode>
            <CardNumber>4111111111111111</CardNumber>
            <CardSecurityCode>123</CardSecurityCode>
            <ExpirationDate>1227</ExpirationDate>
          </PaymentCard>
        </PaymentMethod>
      </PaymentProcessingDetails>
    </PaymentFunctions>
  </Request>
</IATA_OrderChangeRQ>

The response is the updated IATA_OrderViewRS. The bag appears as its own OrderItem (OOI-SR- prefix); the order (which already had a $14 seat from the previous walkthrough) totals $108:

IATA_OrderViewRS — 200 OK (bag order item)
      <OrderItem>
        <OrderItemID>OOI-SR-U3xQVlVTTkF8MjAyNjA5MTV8TVgxNjQ0fFBBWC1RVVJVTFRFfENCMQ</OrderItemID>
        <OwnerCode>MX</OwnerCode>
        <Price>
          <BaseAmount CurCode="USD">0</BaseAmount>
          <Fee>
            <Amount CurCode="USD">35</Amount>
            <DesigText>CB1</DesigText>
          </Fee>
          <TotalAmount CurCode="USD">35</TotalAmount>
        </Price>
        <Service>
          <BookingRef>
            <BookingEntity>
              <Carrier>
                <AirlineDesigCode>MX</AirlineDesigCode>
              </Carrier>
            </BookingEntity>
            <BookingID>JE88TR</BookingID>
            <BookingRefTypeCode>6</BookingRefTypeCode>
          </BookingRef>
          <DeliveryStatusCode>CONFIRMED</DeliveryStatusCode>
          <OrderServiceAssociation>
            <ServiceDefinitionRef>
              <OrderFlightAssociations>
                <PaxSegmentRef>
                  <PaxSegmentRefID>SEG-UFZVU05BfDIwMjYwOTE1fE1YMTY0NA</PaxSegmentRefID>
                </PaxSegmentRef>
              </OrderFlightAssociations>
              <ServiceDefinitionRefID>SD-SR-QnxDQjE</ServiceDefinitionRefID>
            </ServiceDefinitionRef>
          </OrderServiceAssociation>
          <PaxRefID>ADT-1</PaxRefID>
          <ServiceID>SVC-SR-U3xQVlVTTkF8MjAyNjA5MTV8TVgxNjQ0fFBBWC1RVVJVTFRFfENCMQ</ServiceID>
          <StatusCode>CONFIRMED</StatusCode>
        </Service>
        <StatusCode>ACTIVE</StatusCode>
      </OrderItem>

A PaymentProcessingSummary may read PENDING right after the change; retrieve the order and it flips to SUCCESSFUL.

Adding a bag during the initial booking

The same service list exists for a priced offer, before any order — so a booking can be created with its bags in one shot.

1. List services for the priced offer (after OfferPrice, before OrderCreate). The request is the one from step 1 with OfferRequest in place of OrderRequest:

IATA_ServiceListRQ (ServiceListCoreRequest excerpt)
    <ServiceListCoreRequest xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <OfferRequest>
        <Offer>
          <OfferID>OF-96a92874-fcbc-43bd-8c68-b1e95e88156d</OfferID>
          <OfferItem>
            <OfferItemID>OFI-96a92874-fcbc-43bd-8c68-b1e95e88156d-0-ADT</OfferItemID>
            <PaxRefID>ADT-1</PaxRefID>
          </OfferItem>
          <OwnerCode>MX</OwnerCode>
        </Offer>
      </OfferRequest>
    </ServiceListCoreRequest>

The response is the same ALaCarteOffer + ServiceDefinitionList shape as the order-scoped call above — capture the chosen OfferItemID (OFI-SR-…).

2. Include the service item in OrderCreate. Add another SelectedOfferItem under the same SelectedPricedOffer, and pay the combined total. Seat and service items combine freely — this capture booked fare + seat + bag together for a $108 order:

IATA_OrderCreateRQ (CreateOrder excerpt)
    <CreateOrder xmlns="http://www.iata.org/IATA/2015/EASD/00/IATA_OffersAndOrdersCommonTypes">
      <AcceptSelectedQuotedOfferList>
        <SelectedPricedOffer>
          <OfferRefID>OF-96a92874-fcbc-43bd-8c68-b1e95e88156d</OfferRefID>
          <OwnerCode>MX</OwnerCode>
          <SelectedOfferItem>
            <OfferItemRefID>OFI-96a92874-fcbc-43bd-8c68-b1e95e88156d-0-ADT</OfferItemRefID>
            <PaxRefID>ADT-1</PaxRefID>
          </SelectedOfferItem>
          <SelectedOfferItem>
            <OfferItemRefID>OFI-ST-U3xQVlVTTkF8MjAyNjA5MTV8TVgxNjQ0fEFEVC0xfDI0RQ</OfferItemRefID>
            <PaxRefID>ADT-1</PaxRefID>
          </SelectedOfferItem>
          <SelectedOfferItem>
            <OfferItemRefID>OFI-SR-SnwxfFBWVVNOQXwyMDI2MDkxNXxNWDE2NDR8QmFnZ2FnZXxBRFQtMXxDQjE</OfferItemRefID>
            <PaxRefID>ADT-1</PaxRefID>
          </SelectedOfferItem>
        </SelectedPricedOffer>
      </AcceptSelectedQuotedOfferList>
    </CreateOrder>

The PaxRefID on a service item must match the passenger the service was priced for — use the same PaxID values (ADT-1, ADT-2, …) from AirShopping through OrderCreate so they line up. The response is the usual IATA_OrderViewRS: the order arrives OPENED with the bag as its own OOI-SR- order item, everything CONFIRMED from the start.

Notes

Several SelectedOfferItem entries can be submitted at once, which also allows a single payment transaction for multiple items.
Only BOO-generated OFI-SR-* IDs are accepted; SSR codes or client-built IDs are rejected with ERR-1004.
Duplicate services are rejected by the reservation system (one WIFI per passenger per journey, one CB1, and so on). Re-query ServiceList before retrying.

Full schema reference: ServiceList and OrderChange.

Step 1 — ServiceList — list the available services​

Step 2 — OrderChange — accept the service offer​

Adding a bag during the initial booking​

Notes​

Step 1 — ServiceList — list the available services

Step 2 — OrderChange — accept the service offer

Adding a bag during the initial booking

Notes