Hello,
I have gone through the description provided and understand what you want.
Frankly speaking I have never worked with App Annie API before. But I am well experienced in web services & API's. I have worked with several API's including Youtube, Google Analytics, Spreadsheets, Dropbox, MSN adCenter, Facebook etc. Most of the web API's work in the same way. You send a proper structured request and the API sends a structured response.
Which API's from App Annie are you planning to implement ?
Regards,
Vayne