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All messages exchanged with SMX are SOAP messages. They include a SOAP Security header for authentication purposes and contain the SOAP Body contains the OTA message. The following example is a complete SOAP message with the SOAP Security header.

SOAP Envelope

<soap-env:Envelope
	xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">
	<soap-env:Header
		xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">
		<wsse:Security
			xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
			xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" soap:mustUnderstand="1">
			<wsse:UsernameToken>
				<wsse:Username>username</wsse:Username>
				<wsse:Password type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#passwordtext">secret</wsse:Password>
			</wsse:UsernameToken>
		</wsse:Security>
	</soap-env:Header>
	<soap-env:Body
		xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">
		<OTA_HotelResNotifRQ
			xmlns="http://www.opentravel.org/OTA/2003/05" Version="1.0" EchoToken="879791878" ResStatus="Reserved" TimeStamp="2014-10-09T18:51:45">
      ...
    		</OTA_HotelResNotifRQ>
	</soap-env:Body>
</soap-env:Envelope>

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The Security Header structure conveys authentication information. It is mandatory and both the /wsse:UsernameToken/wsse:Username and /wsse:UsernameToken/wsse:Password elements are mandatory. The only acceptable value for the Password/@Type attribute is "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-profile-1.0#PasswordText", indicating a plain text password. Plain text password are acceptable as all communication is done over encrypted HTTP.

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Generally OTA messages transmit "business logic" failures in the <Errors> element structure. However a SOAP fault can be returned in case of an unexpected error caused by for example a SOAP message where the xml cannot be parsed. The SOAP Fault will identify the party at fault (CLIENT/SERVER).

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SOAP Fault - Invalid XML

<SOAP-ENV:Envelope
	xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  	<SOAP-ENV:Header/>
  	<SOAP-ENV:Body>
    		<SOAP-ENV:Fault>
      			<faultcode>
        SOAP-ENV:Client
      </faultcode>
      			<faultstring xml:lang="en"
				xmlns:xml="http://www.w3.org/XML/1998/namespace">
        Authentication failed - invalid username
      			</faultstring>
    		</SOAP-ENV:Fault>
  	</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

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