How to get the total value in the cart to send to the payment aggregator widget?

Question

opencart

There is a code (bank_transfer.tpl - added a handler to the button):

<script >
var amount =    \\тут проблема
  button.onclick = function() {
    var widget = new cp.CloudPayments();
  widget.charge({ // options
    publicId : 'pk', //id из личного кабинета
    description : 'Оплата товаров Shone.kz', //назначение
    amount : amount, //сумма
    currency : 'KZT', //валюта
    invoiceId : '1234567', //номер заказа  (необязательно)
    accountId : '[email protected]', //идентификатор плательщика (необязательно)
    data : {
      myProp : 'myProp value' //произвольный набор параметров
    }
  })
  };
</script>

I'm not familiar with the MVC model and OOP in general, and the code is driving me to the grave.
How to pass the total amount of the cart order to this js code in opencart 2?
What is the easiest way to get the value of a variable? (Total amount of goods)

Answer 1

What is the easiest way to get the value of a variable?

You can even pull it out from the front, since it’s a js script.
But why do you need a widget when there is a ready-made integration for Opencart