Assinatura PagSeguro via API cURL

Opa,

Preciso gerar assinaturas via api com o pagseguro, usando:

$url = "https://ws.sandbox.pagseguro.uol.com.br/v2/pre-approvals/request?email=meu_email@hotmail.com&token=*******";
$xml = '<?xml version="1.0" encoding="charset=ISO-8859-1"?>
	<preApprovalRequest>
 <reviewURL>[http://www.teste.com.br/dashboard/revisao.php](http://www.teste.com.br/dashboard/revisao.php)
 <redirectURL>[http://www.teste.com.br/painel/sucesso.php](http://www.teste.com.br/painel/sucesso.php)
 <reference>EVX01</reference>
 <sender>
 <name>Jose de Solza</name>
 <email>email@gmail.com</email>
 </sender>
 <preApproval>
 <charge>auto</charge>
 <name>testes Ultimate</name>
 <details>
 Todos os dias 26 de cada mes
 </details>
 <amountPerPayment>19.90</amountPerPayment>
 <period>Monthly</period>
 <finalDate>2018-01-21T00:00:000-03:00</finalDate>
 <maxTotalAmount>2500.00</maxTotalAmount>
 </preApproval>
 </preApprovalRequest>
';

 $xml = str_replace("\n", '', $xml);
 $xml = str_replace("\r",'',$xml);
 $xml = str_replace("\t",'',$xml);

 $ch = curl_init();

 curl_setopt($ch, CURLOPT_HTTPHEADER, Array("Content-Type: application/xml; charset=utf-8"));

 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_MAXREDIRS, 2);
 curl_setopt($ch, CURLOPT_AUTOREFERER, true);
 $data = array('entrada' => $xml);
 curl_setopt($ch, CURLOPT_POST, true);
 curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
 $resposta = curl_exec($ch)or die(curl_error($ch));
 curl_close($ch);

 $retorno = simplexml_load_string($resposta);
 $xml = json_encode($retorno);
 $array = json_decode($xml,TRUE);

 print_r($array);

Estou recebendo o retorno do print_r:

Array ( [error] => Array ( [code] => 11101 [message] => preApproval data is required. ) )

O que pode haver de errado?