Getting the history of booking modifications from GDS.
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:avia="http://ws-ibe.com/Avia" xmlns:stl="http://ws-ibe.com/STL">
<soapenv:Header/>
<soapenv:Body>
<avia:GetBookHistory>
<avia:Request>
<stl:Requisites>
<stl:AuthToken>token</stl:AuthToken>
</stl:Requisites>
<stl:UserID>11111</stl:UserID>
<stl:RequestType>P</stl:RequestType>
<stl:RequestBody>
<avia:BookID>127508</avia:BookID>
</stl:RequestBody>
</avia:Request>
</avia:GetBookHistory>
</soapenv:Body>
</soapenv:Envelope>
<?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<GetBookHistoryResponse xmlns="http://ws-ibe.com/Avia">
<GetBookHistoryResult xmlns:a="http://ws-ibe.com/STL" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<a:RequestID>117725763</a:RequestID>
<a:ResponseBody>
<BookID>127508</BookID>
<PNRCode>ABCDEF</PNRCode>
<HistoryElements>
<HistoryElement>
<DateTime>2017-08-04T10:39:57</DateTime>
<HistoryRemarks>
<HistoryRemark>Remark</HistoryRemark>
</HistoryRemarks>
</HistoryElement>
<HistoryElement>
<DateTime>2017-08-04T10:39:56</DateTime>
<HistoryRemarks>
<HistoryRemark>Remark</HistoryRemark>
</HistoryRemarks>
</HistoryElement>
<HistoryElement>
<DateTime>2017-08-04T10:34:17</DateTime>
<HistoryRemarks>
<HistoryRemark>Remark</HistoryRemark>
</HistoryRemarks>
</HistoryElement>
</HistoryElements>
</a:ResponseBody>
</GetBookHistoryResult>
</GetBookHistoryResponse>
</s:Body>
</s:Envelope>