How to send a get request to another site?

Question

HTML

There is such a form

<form id="form" method="GET">
    <p><input type="number" name="sum"></p>
    <p><input type="text" name="account"></p>
                <p><input type="text" name="desc"></p>
    <p><input value="Отправить" id="but" type="button"></p>
  </form>

How to send this data via the link https://unitpay.ru/pay/, like this:
https://unitpay.ru/pay/ PUBLIC KEY?
sum=10& account=demo& desc=Payment description

Answer 1

htmlbook.ru/html/form/action