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    public function connectStandardResponse($state, $code) {

        $paymentHandler = PaymentHandler::where('gateway_state', '=', $state)->first();
        if($paymentHandler != null) {

            // send the token back to stripe to varify
            $stripeRequest = curl_init('https://connect.stripe.com/oauth/token');
            curl_setopt($stripeRequest, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($stripeRequest, CURLOPT_POST, true );
            curl_setopt($stripeRequest, CURLOPT_POSTFIELDS, http_build_query([
                'grant_type' => 'authorization_code',
                'client_id' => '',
                'code' => $code,
                'client_secret' => config('app.stripe_private_key')
            ]));
            $respCode = curl_getinfo($stripeRequest, CURLINFO_HTTP_CODE);
            $stripeResponse = json_decode(curl_exec($stripeRequest), true);
            curl_close($stripeRequest);

            // validate the response
            if($respCode == 0) {
                if(isset($stripeResponse['stripe_publishable_key'])) {

                    // depending on test or live save to appropriate field
                    $paymentHandlerField = 'test_published_key';
                    if($stripeResponse['livemode'] == true)
                        $paymentHandlerField = 'live_published_key';

                    // update the payment handler with the external account details
                    $paymentHandler->$paymentHandlerField = $stripeResponse['stripe_publishable_key'];
                    $paymentHandler->gateway_external_account_key = $stripeResponse['stripe_user_id'];
                    $paymentHandler->save();

                    // notify the user and redirect
                    \SystemMessage::add(trans('app.stripe-connect-account-added'));
                    return Redirect('/admin/payment-handlers/edit/'.$paymentHandler->id);
                }
            }
            throw new Exception('Problem connecting to your Stripe account.');
        }
        throw new Exception('Payment handler not found with state.');
    }