<?php
$email = 'seu email cadastrado no pagseguro';
$token = 'seu token';
$url = 'https://ws.pagseguro.uol.com.br/v2/checkout/?email=' . $email . '&token=' . $token;
$xml = '<?xml version="1.0" encoding="ISO-8859-1" standalone="yes"?>
    <checkout>
        <currency>BRL</currency>
        <redirectURL>http://www.minhaloja.com.br/paginaDeRedirecionamento</redirectURL>
        <items>
            <item>
                <id>1</id>
                <description>1000 Cash</description>
                <amount>1.00</amount>
                <quantity>1</quantity>
                <weight>1000</weight>
            </item>
        </items>
        <reference>REF_1</reference>
        <sender>
            <name>Caio Henrique</name>
            <email>caio_bnh22@hotmail.com</email>
            <phone>
                <areaCode>21</areaCode>
                <number>00000000</number>
            </phone>
        </sender>
    </checkout>';

    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_HTTPHEADER, Array('Content-Type: application/xml; charset=ISO-8859-1'));
    curl_setopt($curl, CURLOPT_POSTFIELDS, $xml);
    $xml= curl_exec($curl);

    curl_close($curl);

    $xml= simplexml_load_string($xml);

    $result = sprintf("https://pagseguro.uol.com.br/v2/checkout/payment.html?code=%s", $xml -> code);
    echo "<a href='$result'>Comprar 1000 Cash</a>";
?>