Every message in GP Travel HUB system requires the following elements:

1.3.1. soap:Envelope

A SOAP message is an ordinary XML document containing the following elements:
Envelope* − Defines the start and the end of the message.
Header − Contains any optional attributes of the message used in processing the message, either at an intermediary point or at the ultimate end-point.
Body* − Contains the XML data comprising the message being sent.

*mandatory

Because of GP Travel HUB works with SOAP each XML request should be wrapped by

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ota="http://www.opentravel.org/OTA/2003/05">
   <soap:Header/>
   <soap:Body>
      <GP_SessionID>2330.109699424758</GP_SessionID>
      ...
      XML REQUEST
      ...
   </soap:Body>
</soap:Envelope>

1.3.2. GP_SessionID

The GP_SessionID is the identifier that can be used by client for its internal purposes. GP Travel HUB does not use or change it. GP_SessionID can be empty or can be set as fake value.

1.3.3. POS

POS element contains parameters for correct client authentication.

<POS>
   <Source>
      <RequestorID ID="ClientLogin" MessagePassword="ClientPassword" Type="22"/>
      <BookingChannel Type="7"/>
   </Source>
</POS>