There's a number of sources that need to be stitched together. The official Apple sources are - iTunes search API: https://www.apple.com/itunes/affiliates/reso

There's a number of sources that need to be stitched together. The official Apple sources are - iTunes search API: https://www.apple.com/itunes/affiliates/resources/documentation/itunes-store-web-service-search-api.html https://www.apple.com/itunes/affiliates/resources/documentat... - Apple's Enterprise Partner feed: https://www.apple.com/itunes/affiliates/resources/documentation/itunes-enterprise-partner-feed.html https://www.apple.com/itunes/affiliates/resources/documentat...