Upsert label

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

{
  "data": {
    "color": "<string>",
    "id": "<string>",
    "name": "<string>"
  }
}