how to check api key passing on request url laravel

how to pass api key with post url.

below is my controller , please advice

 public function postOrder(Request $request)
 {
        $api_key = Config::get('app.key');
        if ($api_key)  
        {

            $Order = $request->only('no_of_kits', 'total')
            $Order = new OrderTestKits;

            $Order ->no_of_kits = $request->input('no_of_kits');
            $Order ->total = $request->input('total');

            $Order ->save();

            return $Order ;
        }                
        else 
        {
            return "api key not found";
        }
}

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