3.0.x-and-above/upload/admin/controller/extension/module/facebook_business.php [340:350]:
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    public function eventPreViewCommonColumnLeft($route, &$data) {
        $facebook_business_menu = array(
            'id'       => 'menu-facebook-business',
            'icon'     => 'fa-facebook-square',
            'name'     => 'Facebook Business Extension',
            'href'     => $this->url->link('extension/module/facebook_business', 'user_token=' . $this->session->data['user_token'], true),
            'children' => array()
        );

        array_unshift($data['menus'], $facebook_business_menu);
    }
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2.3.x-and-above/upload/admin/controller/extension/module/facebook_business.php [334:344]:
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    public function eventPreviewCommonColumnLeft(&$route, &$data) {
        $facebook_business_menu = array(
            'id'       => 'menu-facebook-business',
            'icon'     => 'fa-facebook-square',
            'name'     => 'Facebook Business Extension',
            'href'     => $this->url->link('extension/module/facebook_business', 'token=' . $this->session->data['token'], true),
            'children' => array()
        );

        array_unshift($data['menus'], $facebook_business_menu);
    }
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