Habitica Auto Health Potions

function autoBuyHealthPotion() {
  var habId = "Habitica User ID";
  var habToken = "Habitica API Token";
  var threshold = 35; // when your health is less than this number, it will buy potions
  var multiPotion = true; // if this is true, the script will additionally calculate how many potions need to be bought
  var oneMorePot = true; // better safe than sorry mode - buy one more potion than needed
  var sleepTime = 30000; // pause in the loop for 30000 milliseconds (30 seconds); this is to avoid the servers being overloaded

  var paramsTemplate = {
    "method" : "get",
    "headers" : {
      "x-api-user" : habId,
      "x-api-key" : habToken
    }
  }
  var response = UrlFetchApp.fetch("https://habitica.com/api/v3/user?userFields=stats.hp", paramsTemplate);
  var balance = JSON.parse(response);
  var hpValue = balance.data.stats.hp;

  if (hpValue <= threshold) {
    paramsTemplate = {
      "method" : "post",
      "headers" : {
        "x-api-user" : habId,
        "x-api-key" : habToken
      }
    }

    if (multiPotion) {
      var purchases = (50 - hpValue) / 15; // health potion restores 15 health

      if (oneMorePot && !(hpValue + purchases * 15 == 50)) { purchases++; }

      for (var i = 0; i < purchases; i++) {
        UrlFetchApp.fetch("https://habitica.com/api/v3/user/buy-health-potion", paramsTemplate);
        Utilities.sleep(sleepTime);
      }
    } else {
      UrlFetchApp.fetch("https://habitica.com/api/v3/user/buy-health-potion", paramsTemplate);
    }
  }
}