Unable to get json body response from webhook laravel

I have been trying to get a json response body when webhook hit on my URL but failing. This is my controller method

public function sendSMS(Request $request){

        $response = json_decode(file_get_contents('php://input'));
        Storage::disk('local')->put('file.txt', Response::json($response));

   }

It always save a empty response in .txt. Can you help me out.

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