Response:

{
    "success": true,
    "data": {
        "countries": [
            {
                "country_name": "Australia",
                "isd_code": "61"
            },
            {
                "country_name": "Austria",
                "isd_code": "43"
            },
            {
                "country_name": "Azerbaijan",
                "isd_code": "994"
            },
            {
                "country_name": "Bangladesh",
                "isd_code": "880"
            },
            {
                "country_name": "Belarus",
                "isd_code": "375"
            },
            {
                "country_name": "Belgium",
                "isd_code": "32"
            },
            {
                "country_name": "Brazil",
                "isd_code": "55"
            },
            {
                "country_name": "Canada",
                "isd_code": "1"
            },
            {
                "country_name": "Chile",
                "isd_code": "56"
            },
            {
                "country_name": "China",
                "isd_code": "86"
            },
            {
                "country_name": "Denmark",
                "isd_code": "45"
            }
            .......
        ]
    },
    "message": "Countries fetched successfully"
}