application/modules/payment_method_sberbank/assets/form.tpl
<form method="POST" action="{echo $data['url']}" target="_blank">
<input type="hidden" value="{echo $data['pm']}" name="pm">
<input type="hidden" value="{echo $data['order_id']}" name="order_id">
<input type="hidden" value="{echo $data['price']}" name="price">
<div class='btn-cart btn-cart-p'>
<input type='submit' value='{lang('Оплатить','payment_method_sberbank')}'>
</div>
</form>