curl --request POST \\
  --url https://voip-middlware.superu.ai/phoneNumber/owned \\
  --header 'superU-Api-Key: YOUR_SUPERU_API_KEY'

{
  "status": "success",
  "phone_numbers": [
    {
      "phoneNumberId": "pn_123",
      "number": "+14155552671"
    }
  ]
}