public function angelleye_get_merchant_onboarding_url($baseUrl) {
        try {
            $redirectUrl = OpenIdSession::getAuthorizationUrl(
                            $this->rest_api_return_url, array('openid', 'profile', 'address', 'email', 'phone',
                        'https://uri.paypal.com/services/paypalattributes',
                        'https://uri.paypal.com/services/invoicing'), null, null, null, $this->angelleye_paypal_invoicing_getAuth()
            );
            if (!empty($redirectUrl)) {
                $this->angelleye_set_session('return_url', $baseUrl);
                header("Location: $redirectUrl");
                exit();
            }
        } catch (Exception $ex) {
            $baseUrl = $baseUrl . '&error=' . $ex->getMessage();
            header("Location: $baseUrl");
            exit();
        }
    }