curl --request GET \
  --url https://{subdomain}.mihu.ai/api/v1/phone-numbers/stats \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "total_numbers": 123,
    "action_required": 123,
    "monthly_cost": {
      "amount": 123,
      "currency": "<string>"
    },
    "by_country": [
      {
        "country_code": "<string>",
        "count": 123
      }
    ],
    "by_type": [
      {
        "type": "<string>",
        "count": 123
      }
    ]
  }
}