Laravel Cashier prevent multiple same subscriptions.

Hi,

I have POST route in my API for buying premium account subscription using Stripe/Cashier.

        try {
            if($request->user()->subscribed('premium') || is_null($request->stripeToken))
                return response()->json([
                    'message' => __('app.went_wrong')
                ], 404);
            
            
            $request->user()->newSubscription('premium', 'XXXXXX')->create($request->stripeToken, [
                    'name' => $request->user()->first_name.' '.$request->user()->last_name,
                ]);

            return response()->json([
                'message' => __('app.premium_bought')
            ], 200);
        } catch (Exception $e) {
            return response()->json([
                'message' => __('app.went_wrong')
            ], 404);
        }

If i buy premium account and wait for few second and try to buy it again with same user authenticated i will get message that something went wrong and i have checked that with this if statement

            if($request->user()->subscribed('premium'))

But if i call this url two times in a row it create two subscriptions because this if statement return false because first request didn't finish yet and user is not premium yet.

How can i solve this problem?