To parse SOAP messages iHub uses https://www.npmjs.com/package/xmldom this can either be used by using mustache function or scripted variables.
Number Example
https://www.dataaccess.com/webservicesserver/NumberConversion.wso
Sending SOAP
To run the convert number soap api, create a new Web Action like below.
POST: https://www.dataaccess.com/webservicesserver/NumberConversion.wso
Change the Content-Type to value text/xml header and add the SOAPAction header with value http://schemas.microsoft.com/sqlserver/2004/SOAPsqlbatch
Reading SOAP