<form action="https://demomoney.yandex.ru/eshop.xml" method="POST">
    <input name="paymentType" value="" type="hidden">
    <input name="shopId" value="196994 " type="hidden">
    <input name="scid" value="561824" type="hidden">
    <input name="customerNumber" value="1" type="hidden">
    <input name="sum" value="1900" type="hidden">
    <input name="cps_phone" value="1" type="hidden">
    <input name="shopSuccessURL" value="https://reklamish.ru/custom/payment" type="hidden">
    <input name="cps_email" value="dgastudio@gmail.com" type="hidden">
    <input class="button button--red button--ghost" value="Оплатить" type="submit">
  </form>