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Retell AI

This is the payload retell is sending via webhook after each call.
https://cdn.discordapp.com/attachments/1471067827481083986/1471067827871027305/image.png?ex=698d962d&is=698c44ad&hm=7b12fcfad30c0d413b7db62251f85e55e95fb8dc635448e2415ccd60d2630bea&

Looking at your payload, you have nested message objects which is incorrect.

{
  "event": "call_analyzed",
  "call": {
    "call_id": "call_ef5017ffa32cb26c1f95483ee51",
    "call_type": "web_call",
    "agent_id": "agent_62334ab3b52364677283a790bb",
    "agent_version": 37,
    "agent_name": "Dentist Receptionist Conversation Flow",
    "retell_llm_dynamic_variables": {
      "patient_first_name": "",
      "user_number": "07552460151",
      "token": ""
    }
    // ... other call fields
  }
}

The payload should have event and call at the top level - not wrapped in message objects

I know, but this is the payload I get from retell via webhooks. 
Retell is sending it nested for call_analyzed event.