Both Apple and Google handle any in-app purchase made and so this revenue likely won't show across your web-platform. Instead, it will show inside App Store Connect and the Google Play Console.
To view your iOS in-app purchase analytics:
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Click here
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Click Sales and Trends and here you will see your In-App Purchases and Sales analytics
To view your Android in-app purchase analytics:
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Click here
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Select your app
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Click Financial reports and here you will see analytics including Revenue and Conversions