Vapi is the Voice AI platform for developers.

Vapi AI

Hi, I'm getting this error when creating a call through the VAPI API:

The following is the response:
{
    "error": "Bad Request",
    "message": [
        "id must be a UUID"
    ],
    "statusCode": 400
}

The following is the body of the request:

  vapi_call_payload = {
    "maxDurationSeconds": 1800,
    "assistantId": assistant_id,
    "customer": {
        "number": f"{number}",
        "name": f"{name}",
        "extension": "+1"
    },
    
     "phoneNumber": {
        "twilioPhoneNumber": os.environ["VAPI_TWILIO_NUMBER"],
         "twilioAccountSid": os.environ["VAPI_TWILIO_SID"],
         "twilioAuthToken": os.environ["VAPI_TWILIO_AUTH_TOKEN"],
         "name": "",
         "assistantId": f"{assistant_id}",
         "serverUrl": "<string>",
         "serverUrlSecret": "<string>"
     }
  }

What am I missing here?