List available regions

{
    "success": true,
    "regions": [
        {
            "id": "CANADA-1",
            "name": "Canada",
            "tier": "legacy"
        },
        {
            "id": "FINLAND-1",
            "name": "Finland 1",
            "tier": "advanced"
        },
        {
            "id": "FINLAND-2",
            "name": "Finland 2",
            "tier": "advanced"
        },
        {
            "id": "FINLAND-3",
            "name": "Finland 3",
            "tier": "advanced"
        },
        {
            "id": "ICELAND-1",
            "name": "Iceland",
            "tier": "advanced"
        }
    ],
    "request_id": "5b86c0b3"
}