Set up instructions for SDK providers

SDK providers must use their own Google Cloud project to call the Play Integrity API, so that API usage is attributed to the SDK and not to individual apps using the SDK. This means that apps that use your SDK don't have to individually set up the Play Integrity API. Your requests to Play Integrity API automatically count towards your SDK's API usage and not the app.

SDK developers have two options to set up Play Integrity API, the Google Play SDK Console or the Google Cloud Console.

Use Google Play SDK Console (recommended)

By enabling Play Integrity API responses in the Google Play SDK Console, you gain access to additional configuration options. Navigate to SDK integrity < Settings. Under Project configuration select Link a Cloud project. Choose the Cloud project you want to link to your SDK and this will enable Play Integrity API responses. You can now integrate the Play Integrity API into your SDK.

Use Google Cloud Console

You can enable Play Integrity API responses from your Google Cloud Console. In your Google Cloud Console, create a new Cloud project or choose an existing Cloud project that you want to use with the Play Integrity API. Navigate to APIs and services. Select enable APIs and services. Search for Play Integrity API and then enable it. You can now integrate the Play Integrity API into your SDK.

Source : https://developer.android.com/google/play/integrity/setup#set-instructions-sdk