[UnityWebRequest] Api connexion without using php script

Hi, i'm connecting to an API using a php script on my server with UnityWebRequest.

My php script :

Code (CSharp):

1.  
2.     $apikey=$_POST['apikey'];
3.     $apisecret=$_POST['apisecret'];
4.     $nonce=time();
5.     $uri='https://apiurl.com/api/getdata?apikey='.$apikey.'&nonce='.$nonce;
6.     $sign=hash_hmac('sha512',$uri,$apisecret);
7.     $ch = curl_init($uri);
8.     curl_setopt($ch, CURLOPT_HTTPHEADER, array('apisign:'.$sign));
9.     $execResult = curl_exec($ch);
10.     $obj = json_decode($execResult);
11.  

My C# script on Unity :

Code (CSharp):

1.     string url = "https://myserver.com/abc.php";
2.         WWWForm form = new WWWForm();
3.         form.AddField("apikey",data.ApiKey);
4.         form.AddField("apisecret",data.ApiSecret);
5.         UnityWebRequest uwr = UnityWebRequest.Post(url,form);
6.         yield return uwr.SendWebRequest();
7.         if(uwr.isNetworkError || uwr.isHttpError){
8.             Debug.Log(uwr.error);
9.         }else{
10.             Debug.Log(uwr.downloadHandler.text);

Do you think it's possible to avoid using the php script and connect directly to the API server and save some time?
Thanks.