@Johannes
Yes, VAPI does support user authentication mechanisms, including the use of a spoken passphrase or number that can be matched to a unique user ID. This allows for personalized interactions and ensures that content is appropriately stored and associated with the correct user across multiple sessions.
To implement this, you would typically have a voice recognition system that captures the spoken number or passphrase and then matches it to a user profile in your database. If you need assistance with setting up such a system or have any specific questions about how to integrate this with VAPI, please let me know, and I'll be happy to help you further!