3.0.x-and-above/upload/admin/controller/extension/module/facebook_business.php [272:285]:
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    public function deleteSettings() {
        $json = array();

        $this->load->model('setting/setting');

        if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {
            $this->model_setting_setting->deleteSetting('facebook');

            $json['success'] = true;
        }

        $this->response->addHeader('Content-Type: application/json');
        $this->response->setOutput(json_encode($json));
    }
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2.0.x-2.2.x/upload/admin/controller/module/facebook_business.php [178:191]:
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    public function deleteSettings() {
        $json = array();

        $this->load->model('setting/setting');

        if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {
            $this->model_setting_setting->deleteSetting('facebook');

            $json['success'] = true;
        }

        $this->response->addHeader('Content-Type: application/json');
        $this->response->setOutput(json_encode($json));
    }
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2.3.x-and-above/upload/admin/controller/extension/module/facebook_business.php [265:278]:
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    public function deleteSettings() {
        $json = array();

        $this->load->model('setting/setting');

        if (($this->request->server['REQUEST_METHOD'] == 'POST') && $this->validate()) {
            $this->model_setting_setting->deleteSetting('facebook');

            $json['success'] = true;
        }

        $this->response->addHeader('Content-Type: application/json');
        $this->response->setOutput(json_encode($json));
    }
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