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===== Insert into Cart ====

      $data = Product::where('listingID', $id)->first();
        $i = 1;
        if ($data) {
            if (!session('order_session')) {
                $cartData = array(
                    'items' => array(
                        $id => array(
                            'record' => $data,
                            'quantity' => 1
                        ),
                    ),
                    'total_price' => '',
                    'user_id' => Auth::id(),
                );
                $request->session()->put('order_session', $cartData);
            } else {
                $cartData = session('order_session');
                if (isset($cartData['items'][$id])) {
                    // Items Already Present , just increase its quanitity
                    $cartData['items'][$id]['quantity'] += 1;
                    $request->session()->put('order_session', $cartData);

                } else {
                    // Items already not present in cart , add new 
                    $cartData['items'][$id] = array('record' => $data, 'quantity' => 1);
                    $request->session()->put('order_session', $cartData);
                }
            }
            
        } else {
            return back();
        }

=== Delete from Cart ====

public function delete_form_cart($id, Request $request)
    {
        $data = session('order_session');
        if ($data) {
            if (isset($data['items'][$id])) {
                unset($data['items'][$id]);
                $request->session()->put('order_session', $data);
                return response()->json(['status' => 'success', 'message' => 'Successfull!']);
            }
        }
    }

===== Update item in Cart =====
    public function update_cart_item($id, $quantity, Request $request)
    {
        $data = session('order_session');
        if ($data) {
            if (isset($data['items'][$id])) {
                $data['items'][$id]['quantity'] = $quantity;
                $request->session()->put('order_session', $data);
                return response()->json(['status' => 'success', 'message' => 'Successfull!']);
            }
        }
    }