Log out the currently active shopper.  Introduced in 2.19.4.
            | Method | Logout | 
The request body is of type Logout.
// Example: Logout the current shopper MakeAJAXCall("Visitor.Logout", {}, console.log)
The response body is of type LogoutResponse.
| Name | Description | Data Type | 
|---|---|---|
| LogoutResult | A string value containing a JSON object. 
{
    "Result": {
        "Success": true,
        "Message": "The account was logged out successfully and the session was ended.",
        "ElapsedTime": "75 ms"
    }
}
 | xml:string |