How to implement response URL that gets called from Payment gateway

Hi,

I am developing an application that uses Atom payment gateway. Once a payment is done on Atom Payment gateway page, it redirects the user back to a order received page with payment status. This URL is passed to Atom Payment gateway as part of payment request.

The problem is when I print the request variable, it always prints an empty array. I am not sure if I am doing this the correct way.

There is the URL being passed to Atom as part of payment request.

http://xxxxxxx.com/alliedorder/order-received/

Here is the route I have added in my web.php file

Route::get('/alliedorder/order-received/', 'AlliedServicesController@displayOrderResult');

And here is my controller method

public function displayOrderResult(Request $request) {
    
    dd(request()->all());
            
    return view('usernav.orderResult');
}

dd(request()->all())) prints an empty array.

when I change my Route from get to post, i am getting methodNotAllowed Exception. at RouteCollection->methodNotAllowed(array('POST')) in RouteCollection.php line 220

Please help me in resolving this issue.