FTX compounder

/*
First execute this function once with your apikey and apisecret to set them as script property. You can delete the value after it.
*/
function myFunction() {
  var keys = {apikey: 'xxx', apisecret: 'xxx'};
  PropertiesService.getScriptProperties().setProperties(keys);
}


var uri = 'https://ftx.com'
var basepath = '/api'
var keys = PropertiesService.getScriptProperties().getProperties();


function KeepLending(){
  var coin = "BNB";
  var subaccount = "xx";

  var target = GetBalance().find((v) => v.coin === coin)

  var size = Math.floor(target.total*1000000)/1000000;
  var rate = 1e-6;
  var data = {"coin": coin, "size": size, "rate": rate};
  var payload =JSON.stringify(data);

  var ts = String(Date.now());
  var method = "POST";
  var command = basepath + "/spot_margin/offers";
  var sign = toHexString(Utilities.computeHmacSha256Signature(ts + method + command + payload, keys.apisecret));

  function toHexString(byteArray) {
    return Array.from(byteArray, function(byte) {
      return ('0' + (byte & 0xFF).toString(16)).slice(-2);
    }).join('')
  }
  var header = {
    'FTX-KEY' : keys.apikey,
    'FTX-TS' : ts,
    'FTX-SIGN' : sign,
    'FTX-SUBACCOUNT' : subaccount
  };
  var options = {
    'method' : method,
    'headers' : header,
    'contentType': 'application/json',
    'payload' : payload
  };


var result = UrlFetchApp.fetch(uri + command, options);

  Logger.log(result);
}