I'm searching a solution to get all the information/retrieve all data from the iTunes «App Store» and «Mac App Store» from Apple to a given App-ID … Is there a way to read out all the infos like App-Description, Price, Icon, Developer, Ratings etc. from the Stores?
Try using the iTunes Search API which will give you a nice JSON object representing the app. The lookup section is the one you are looking for:
https://affiliate.itunes.apple.com/resources/documentation/itunes-store-web-service-search-api
Example query for the Stack Overflow App: https://itunes.apple.com/lookup?id=1155618808