How to handle get request to my api from a soap server

i am working with a soap api in my lumen api, i already use artisaninweb/laravel-soap package to handle calls to soap to the soap server but the soap server will also need to call an endpoint from my lumen server but i do not know how to handle this request.

i have a route

$router->get('/notify',
    [
        'as' => 'sms.notify',
        'uses' => 'NotificationController@notify'
    ]
);

when the soap server calls my end point, how do i handle the request.