curl --request PUT \
  --url https://api.wappfy.com.br/api/{session}/labels/{labelId} \
  --header 'Content-Type: application/json' \
  --header 'apikey: <api-key>' \
  --data '{
  "name": "Lead",
  "colorHex": "#ff9485",
  "color": null
}'

{
  "id": "1",
  "name": "Lead",
  "color": 0,
  "colorHex": "#ff9485"
}