Protect Your Apps.
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// Validate license on app startup
var result = await LicenseClient.Validate(
    licenseKey: userEnteredKey,
    deviceId:   GetDeviceFingerprint()
);

if (result.Valid) {
    // ✅ App unlocked — plan: result.Plan
} else {
    // ❌ Show activation screen
    // reason: result.Reason
}