curl --request POST \
  --url https://api.wavix.com/v3/messages/opt-outs \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "opt_out": {
    "number": "16419252149",
    "sender_id": "15072429497"
  }
}
'

{
  "success": true
}