application/modules/payment_method_liqpay/assets/form.tpl
<form id="paidForm" method="POST" action="https://www.liqpay.com/api/pay"
accept-charset="utf-8">
<input type="hidden" name="public_key" value="{echo $data['public_key']}"/>
<input type="hidden" name="amount" value="{echo $data['amount']}"/>
<input type="hidden" name="currency" value="{echo $data['currency']}"/>
<input type="hidden" name="description" value="{echo $data['description']}"/>
<input type="hidden" name="order_id" value="{echo $data['order_id']}"/>
<input type="hidden" name="result_url" value="{echo $data['result_url']}"/>
<input type='hidden' name='server_url' value='{echo $data['server_url']}'/>
<input type="hidden" name="type" value="buy"/>
<input type="hidden" name="signature" value="{echo $signature}"/>
<div class='btn-cart btn-cart-p'>
<input type='submit' value='{lang('Оплатить','payment_method_liqpay')}'>
</div>
</form>