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The cost can be calculated on the Pricing page.
Google Play App Intersection Live
This endpoint will provide you with a list of keywords for which the mobile applications specified in the app_ids object rank within the same Google Play SERP.
The app_id parameter can be found on the Google Play website as a part of a URL pointing to a specific mobile application. For example, here is the URL of the Telegram app on Google Play:
https://play.google.com/store/apps/details?id=org.telegram.messenger
The app_id of this app is org.telegram.messenger