public function apiGetCouponCode()
 {
     $couponCode = Miscellaneous::generateRandomString((int) $this->request->input('length'), 'uppercase-number');
     while (CartPriceRule::where('coupon_code_120', $couponCode)->count() > 0) {
         $couponCode = Miscellaneous::generateRandomString((int) $this->request->input('length'), 'uppercase-number');
     }
     return response()->json(['status' => 'success', 'couponCode' => $couponCode]);
 }