curl --request POST \
  --url https://api.assistable.ai/v2/ghl-chat-completion \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "conversation_id": "<string>",
  "contact_id": "<string>",
  "last_message_id": "<string>",
  "channel": "<string>",
  "input": "<string>",
  "location_id": "<string>",
  "assistant_id": "<string>",
  "messages": [
    {}
  ]
}
'

{
  "run": {
    "response": {
      "messages": [
        {
          "role": "<string>",
          "content": "<string>",
          "refusal": "<string>",
          "annotations": [
            {}
          ]
        }
      ],
      "toolCalls": [
        {}
      ],
      "completionTimestamp": "2023-11-07T05:31:56Z"
    },
    "message": {
      "conversationId": "<string>",
      "messageId": "<string>",
      "traceId": "<string>"
    },
    "knowledge_base": {
      "matches": [
        {
          "id": "<string>",
          "score": 123,
          "values": [
            {}
          ],
          "metadata": {
            "text": "<string>"
          }
        }
      ],
      "namespace": "<string>",
      "usage": {
        "readUnits": 123
      }
    },
    "input": "<string>",
    "output": "<string>"
  }
}