curl --request GET \
  --url https://api.onswitch.xyz/country \
  --header 'x-service-key: <api-key>'

{
  "success": true,
  "message": "Countries fetched successfully",
  "timestamp": "2024-01-01T00:00:00.000Z",
  "data": [
    {
      "code": "NG",
      "name": "Nigeria"
    },
    {
      "code": "US",
      "name": "United States"
    }
  ]
}