Your account will be charged for setting a task and the number of reviews you will get in the items array. The cost can be calculated on the Pricing page.
Setting Google App Reviews Tasks
This endpoint will provide you with reviews published on the Google Play platform for the app specified in the app_id field. The returned results are specific to the indicated language and location parameters.
The app_id parameter can be found on the Google Play website as a part of the 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
Your account will be charged for every 150 reviews returned, e.g., if you specify "depth": 151, you will be charged as per 300 reviews.