how can i determin that the input is checked in controller?

there is a controller to save orders and there is some checkbox inputs .

i try to explain that if that input is checked ... some code must be run. but in any conditional mode

$debatorprice, $payment and $kalaf are returned null

public function store(Request $request)
{
     if ($request['image']){

         $file = $request['image'];
         $imgname = $file->getClientOriginalName();
         $this->ImageUploader($file, '/upload/orders/');
     }else{
         $imgname=null;
     }

     $payment="";
     $debatorprice="";
        if ($request->has('paymentstatus')){
            $payment=1;
            $debatorprice=0;
        }else{
            $payment=0;
            $totalprice=$request->totalprice;
            $beforeprice=$request->beforeprice;
            $debatorprice=$totalprice-$beforeprice;
        }
        $kalaf='';
        if ($request->has('kalaf')){
            $kalaf=1;
        }else{
            $kalaf=0;
        }

        offlineorder::create([

            'ProductType'=>$request->producttype,
            'OtherProduct'=>$request->otherproduct,
            'CustomerName'=>$request->customername,
            'CorporateName'=>$request->corporatename,
            'Phone'=>$request->phone,
            'Width'=>$request->width,
            'Height'=>$request->height,
            'Model'=>$request->model,
            'Material'=>$request->material,
            'Color'=>$request->color,
            'Count'=>$request->count,
            'Kalaf'=>$request->kalaf,
            'Image'=>$imgname,
            'Text'=>$request->text,
            'Description'=>$request->description,
            'TotalPrice'=>$request->totalprice,
            'BeforePrice'=>$request->beforeprice,
            'PaymentStatus'=>$payment,
            'DebtorPrice'=>$debatorprice,
            'SKU'=>$request->sku,
            'ChapStatus'=>0,
            'DesignStatus'=>0,
            'View'=>0,
            'Link'=>0,

        ]);

        session()->flash('add_order','سفارش شما با موفقیت ثبت شد');
        return back();
    }

i try if ($request->paymentstatus==null) but it didn't work too