Macro creation -- Add-in integration

Hello,

I'm currently developing several Dashboards using an add-in to extract data from web services (such as Google Analytics). Given some of these webservices dont give the opportunity to make webQuery, I'd like to know if any1 could answer to this unsolved question:

- May I integrate an add-in (request) in Macro? If yes, how would it be possible to develop this macro?

Please, I'm looking for this answer for several weeks already. So if you have any clue, feel free to share :)

Thanks

KR,
Théry