Add a label to a conversation

curl --request POST \
  --url https://api.wazapin.com/v1/conversations/{convID}/labels \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "label_id": "<string>"
}
'

{
  "code": "<string>",
  "error": "<string>",
  "details": [
    {
      "location": "<string>",
      "message": "<string>",
      "value": "<unknown>"
    }
  ]
}