curl --request POST \
  --url https://api.withallo.com/v2/api/conversations/items/{id}/tags \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "tags": [
    "qualified",
    "follow_up"
  ]
}
'

{
  "error": {
    "type": "<string>",
    "code": "<string>",
    "message": "<string>",
    "retryable": true,
    "request_id": "<string>",
    "retry_after_seconds": 123
  }
}