help with code need show the response

hi i have this code my problem this not show me the response of send if send ok or have error the code work great but without response private function sendSMS($sender, $receiver, $message) { if (!$this->config->get('plivosms_auth_key') || !$this->config->get('plivosms_auth_secret')) { return; } $auth_id = $this->config->get('plivosms_auth_key'); $auth_token = $this->config->get('plivosms_auth_secret'); $data = array("src" => "$sender", "dst" => "$receiver", "text" => "$message"); $data_string = json_encode($data); $url = '[login to view URL]'.$auth_id.'/Message/'; $curl = curl_init(); curl_setopt($curl, CURLOPT_USERPWD, $auth_id . ":" . $auth_token); curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type: application/json')); curl_setopt($curl, CURLOPT_POST, true); curl_setopt($curl, CURLOPT_POSTFIELDS, $data_string); curl_setopt($curl, CURLOPT_HEADER, false); curl_setopt($curl, CURLINFO_HEADER_OUT, true); curl_setopt($curl, CURLOPT_USERAGENT, 'OpenCart Plivo Integration'); curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false); curl_setopt($curl, CURLOPT_FORBID_REUSE, false); curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); curl_setopt($curl, CURLOPT_FRESH_CONNECT, true); curl_setopt($curl, CURLOPT_URL, $url); $response = curl_exec($curl); if (curl_errno($curl)) { $curl_error = 'Plivo cURL Error ' . curl_errno($curl) . ': ' . curl_error($curl); } else { $curl_error = ''; } if ($curl_error) { $this->log->write($curl_error); } if ($this->config->get('plivosms_debug')) { $this->log->write($response); } curl_close($curl); }