The Denodo Platform Web Service data source can authenticate the web services based on HTTP (Basic, Digest, NTLM and SPNEGO (Kerberos) and WSS (Basic and Digest) but LTAP is not available as of now.
If I have to use the webservice and the Web service provider does not allow any of the above specified authentication methods then I would use SOAP WSSE Header to authenticate and consume the Web Service.
Create a new XML Data source with HTTP client, post (use POST Method) the complete SOAP message along with the LTPA token added to the SOAP Header in the specific format, the steps and actions are detailed on IBM Community Article [IBM - Calling Web Services with LTPA based WS-Security BinaryToken Profile](https://www-10.lotus.com/ldd/pfwiki.nsf/dx/ibm-calling-web-services-with-ltpa-based-ws-security-binarytoken-profile)
The SOAP Request can be generated dynamically from Denodo with interpolation variable in place, please refer the KB article [How to Import a SOAP Web Service using an XML data source](https://community.denodo.com/kb/view/document/How%20to%20Import%20a%20SOAP%20Web%20Service%20using%20an%20XML%20data%20source?category=Data+Sources).
Hope this helps!