$curl = curl_init($this->endPoint);

                $curlopt = [
                    CURLOPT_RETURNTRANSFER => true,
                    CURLOPT_SSL_VERIFYPEER => false,
                    CURLOPT_SSL_VERIFYHOST => false,
                    CURLOPT_HEADER => false,
                    CURLOPT_FAILONERROR => false,
                    CURLOPT_HTTP200ALIASES => array(409)
                ];

                if(strtoupper($f['method']) == 'POST'){
                    $curlopt[CURLOPT_POST] = TRUE;
                    $curlopt[CURLOPT_POSTFIELDS] = $this->format_query($this->parameters);
                } else if(strtoupper($f['method']) != 'GET'){
                    $curlopt[CURLOPT_CUSTOMREQUEST] = strtoupper($f['method']);
                    $curlopt[CURLOPT_POSTFIELDS] = $this->format_query($this->parameters);
                } elseif(count($f['method'])){
                    $url .= strpos($url, '?')? '&' : '?';
                    $url .= $this->format_query($this->parameters);
                }

                $curlopt[CURLOPT_URL] = $url;

                curl_setopt_array($curl, $curlopt);
                var_dump($this->parse_response(curl_exec($curl))); // this false
                echo curl_getinfo($curl, CURLINFO_HTTP_CODE); // this is 409