# Vapi Integration

To use vapi assistant, you have to specify `OTO_USER_ID` to identify

For setting up the Vapi Assistant, you must ensure that you specify the `OTO_USER_ID` to uniquely identify users. This is done by including the user identifier within the `metadata` object when starting the assistant instance.

Example:

```javascript
const userId = 'unique-user-id'; // Replace with your actual user ID
vapi.start(assistantId, {
    metadata: {
        "OTO_USER_ID": userId,
    },
});
```

The `OTO_USER_ID` serves as a primary identifier linking all your actions within the assistant, while the `call.id` is specific to each session or interaction instance. This ensures a unique session context is maintained for every conversation initiated by the user. Proper management of these identifiers enhances user tracking capabilities and optimizes interaction handling within the Vapi Assistant framework.
