Xamarin app ↔ OAuth backend: Secure Storage credential validity and refresh decision
Goal: Ensure a Xamarin mobile app stores only the minimum credentials needed for API access and recovers gracefully when those credentials become invalid at the integration boundary with its OAuth‑protected backend. Constraints: Xamarin.Essentials Secure Storage is limited to small values and relies on platform key stores (iOS Keychain, Android Keystore) tha
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