I need to Get data from Anaplan and import them into a SQL Server using Microsoft Integration Services (SSIS). Does Anaplan support it? (e.g. WebService)? If yes, who can provide me the WSDL File?
Yes. Here's an article on how to call and REST API in SSIS. Recommend you use a CA certificate though. Usually, not a good idea to use basic authentication where your password is exposed.
How to Call REST API in SSIS - Read JSON / XML / CSV | ZappySys Blog
Anaplan has many endpoints, so it depends on how you set up your exports from Anaplan. This is usually done with a saved view and a manual export is performed to generate the export action. You can read about Anaplan's REST API's here.