functional restfull call

function callApi($method, $function, $data = false)
    {
        $curl = curl_init();

        $url = $this->parentUrl.$function;

        switch ($method)
        {
            case "POST":
                curl_setopt($curl, CURLOPT_POST, 1);

                if ($data)
                    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
                break;
            case "PUT":
                curl_setopt($curl, CURLOPT_PUT, 1);
                break;
            default:
                if ($data)
                    $url = sprintf("%s?%s", $url, http_build_query($data));
        }


        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $headers = [
            'APIKey: '.$this->apiKey,
            'MerchantId: '.$this->merchantId,
            'StationId: '.$this->stationId,
            'Content-Type: application/json'
        ];
        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        $result = curl_exec($curl);

        curl_close($curl);
        return $result;
    }