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Is there an Apple App Store API?
Yes. Social Fetch has eight Apple App Store routes under /v1/apple-app-store: one app, many apps in a batch, app details, reviews, in-app purchases, search, developer catalogues and charts. Authenticate with your Social Fetch API key in x-api-key.
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This answer comes from Apple App Store data API, which covers the full detail, endpoints and pricing in credits.