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See Server side integration basics
For detailed methods / classes / types description see Javadoc SDK Client API
WSA is meant for all platforms like PHP, C# except Java (Java is also possible but we provide a full module so WSDL import is redundant).
Web service is a standalone “application” which must be deployed on same server as AIM. Its default address is like this:
https://hostname/wsa
There you will see WSA Interface homepage where you can download WSDL file to generate client.
https://hostname/wsa?wsdl
See basic examples in C# and PHP using WSA web service