Currently, there is no webservice because the Store module is compatible with older DNN versions 4.6.2+. Only DNN 6.2+ can create (easily) web services with the new Service Framework. Otherwise, because the source code is available at Codeplex, you could create your own services and use DNN and Store API to do it.

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We (team members) are Humans offering their knowledge, their work and their spare time FOR FREE to benefit the community. It would be so particularly appreciated that your messages begin with "Hello" and end with "Thank you" or any other form of politeness. Ask yourself what your reaction would be, if you were approached by me (a total stranger) on the street to ask you something without saying "Hello" nor "Thank you"? After several years of services dedicated to the community, I begin to be tired to read requests without any form of politeness.