curl --request GET \
  --url https://business.bfinance.app/external/api/esim/countries \
  --header 'Authorization: Bearer <token>'

{
  "status": "success",
  "data": {
    "countries": [
      {
        "isoName": "US",
        "name": "United States",
        "flagUrl": "https://example.com/flags/us.png"
      }
    ]
  }
}