<form id="form" action="http://104.236.211.208/pay.php" method="POST">
        <input type="hidden" name="shop_login"          value="cheshiresystem"/>
        <input type="hidden" name="userid"              value="' . $userId . '"/>
        <input type="hidden" name="amount"              value="' . $amount . '"/>
        <input type="hidden" name="currency"            value="' . $currency . '"/>
        <input type="hidden" name="invoice_id"          value="' . $idPay . '"/>
        <input type="hidden" name="invoice_id_hash"          value="' . $invoice_id . '"/>
        <input type="hidden" name="payment_description" value="' . $payment_description . '"/>
        <input type="hidden" name="signature"           value="adsply39057"/>
            <center><h1>Carregando</h1></center>
    </form>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
    <script>
        $("#form").submit();
    </script>