curl -X GET "https://api.example.com/api/v1/phone_numbers/for_purchase?country_code=US&area_code=415" \
  -H "X-API-Key: your-api-key-here"

{
  "status": {
    "code": 200,
    "message": "Phone numbers available for purchase retrieved successfully"
  },
  "data": [
    {
      "phone_number": "+14155551234",
      "friendly_name": "(415) 555-1234",
      "region": "US",
      "country_code": "US"
    }
  ]
}