Integrations Integrate Whistle with FLEXIPASS With Whistle and FLEXIPASS, hoteliers now have access to the world’s fastest and easiest way to send digital keys automatically. Book free demo Master keyless mobile Whistle will be integrated into your platform once FLEXIPASS confirms integration. Once enabled, you now have smart, quick and easy way to offer guests keyless entry. Continue reading “Whistle x FLEXIPASS”