Forward Gmail message to end point

forwardToAdmin.js

function forwardToAdmin() {
  //Define
  //EndPoint URL
  var endpoint = "https://your-admin-domain.com/endpoint.php";
  //BasicAuthForEndPoint
  var unamepass = "username:password";
  //Label
  var LabelIn = "ToAdmin";
  var LabelArchive = "ToAdmin/Archive";

  //GetThreads from label:ToAdmin
  var label = GmailApp.getUserLabelByName(LabelIn);
  var threads = label.getThreads();

  for (var i=0; i < threads.length; i++) {
    var subject   = threads[i].getFirstMessageSubject();
    var messages  = threads[i].getMessages();
    for (var j=0; j < messages.length; j++) {
      var message   = messages[j];
      if (!message.isUnread()) {
        continue;
      }

      var from      = message.getFrom();
      var body      = message.getBody();

      var payload = {
        "subject"  : subject,
        "body"     : body,
        "from"     : from,    
      };

      var digestfull = "Basic "+ Utilities.base64Encode(unamepass);

      var options = {
       "method"   : "post"
       ,"payload"  : payload
       ,"headers"  : {"Authorization":digestfull}
      };

      var response = UrlFetchApp.fetch(endpoint, options);
      message.markRead();
    }
  }
  
  //LabelToArchive
  var labelToMove = GmailApp.getUserLabelByName(LabelArchive);
  labelToMove.addToThreads(threads);
  label.removeFromThreads(threads);
}