Cant stay logged in server with www class

first i apologize if i dont get this question right....... but im new to this forum as well as to Unity , so i have my scene and i made a login and register system for it using the www class and got it " working " , i can post the register info , and log in , i get a JSON response from the REST server with my user id and name as well as last log and update on the " www.text" but when i try to upload more info as a logged user it gives me the 403 error and i cant figue out why it is, i can only think it does not stay logged, i have already tested the post and get params with Chrome´s Advance REST Client App and it is working fine , i would appreciate some help with this since ive been stuck on this for a while.

here is the code im using for the forms

function login() {

var form = new WWWForm();

form.AddField("user",user); form.AddField("pass",pass); var headers = form.headers; var rawData = form.data; var url = "the login URL"; headers["X-API-KEY"]="the key";

     var www = new WWW(url, rawData, headers);

    yield www;
    
    if (www.error != null) 
         
     print(www.error);
  
     
     else
     Sync();

}

function Sync() {

     var form = new WWWForm();
     form.AddField("param","value1");        

var headers = form.headers; var rawData = form.data; var url = "the sync URL"; headers["X-API-KEY"]="the key"; var www = new WWW(url, rawData, headers);

    yield www;
    
    if (www.error != null) 
    print (www.error);
    
    

     else

     print (www.text);
      
    
  }  

Thank you in Advance for any of the great help..........