AppCheckProvider
Produces AppCheckTokens, mirroring com.google.firebase.appcheck.AppCheckProvider. App Check calls it whenever it needs a new token. Implement it, with an AppCheckProviderFactory, to attest the app with a backend of your own: its tokens are used as they are.
Functions
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Returns a new limited-use token, for a backend with replay protection; getToken unless overridden.
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Returns a new, valid token, or fails when the app cannot be attested.