Get account overview

{
    "success": true,
    "data": {
        "customer": {
            "id": "cmlcta3bw001onul0lu4vibp2",
            "email": "you@yourdomain.com",
            "name": "Your Name",
            "createdAt": "2025-01-15T10:00:00.000Z"
        },
        "allocations": [
            {
                "type": "MICROSOFT",
                "allocated": 10,
                "used": 3,
                "remaining": 7
            },
            {
                "type": "GOOGLE",
                "allocated": 0,
                "used": 0,
                "remaining": 0
            },
            {
                "type": "SMTP",
                "allocated": 50,
                "used": 12,
                "remaining": 38
            },
            {
                "type": "SMTP_DEDICATED",
                "allocated": 0,
                "used": 0,
                "remaining": 0
            }
        ],
        "summary": {
            "totalDomains": 5,
            "activeDomains": 3,
            "pendingMailboxRequests": 2,
            "activeApiKeys": 4
        }
    }
}