Doubts about Bradesco boleto integration

Question

I’m having doubts about how to integrate this Bradesco payment solution. That’s the documentation

I don’t know if it’s via POST, via GET, if it’s via XML. I’m confused.. I tried something like this

<?php

 $adm = '0000';
 $order = '1';
 $url = "http://mupteste.comercioeletronico.com.br/sepsBoleto/".$adm."/prepara_pagto.asp?merchantid=".$adm."&orderid=".$order."&numOrder=".$order;

 if($_GET){
    echo '<pre>';
    print_r($_GET);
 }
?>

<form method="post" action="<?php echo $url  ?>">
    <input type="hidden" value="1"      name="orderid">
    <input type="hidden" value="dasdad" name="descritivo">
    <input type="hidden" value="1"      name="quantidade">
    <input type="hidden" value="UN"     name="unidade">
    <input type="hidden" value="150"    name="valor">
    <input type="hidden" value="150"    name="valor">
    <button type="submit">Submit</button>
</form>

but I’m not successful