Get the url of the Paypal payment slip

Question

I have a problem to pick up the Paypal ticket and open in a new browser tab. When I send the data and choose boleto the transaction is executed normally but I’m not able to pick up the return to display the boleto pro client. In Javascript I did so:

}else if(form_pg === 'BOLETO'){               
            $.ajax({
                type:'POST',
                url: 'routers/boleto.php',
                data:{sHash:sHash,
                    name:name,
                    email:email,
                    ddd:ddd,
                    telephone:telephone,
                    form_pg:form_pg,
                    cep:cep,
                    street:street,
                    numberHouse:numberHouse,
                    complement:complement,
                    neighbordhood:neighborhood,
                    city:city,
                    state:state,
                    cpf:cpfBoletoBalance,                                                            
                    valor:valor
                },
                 dataType:'json',
                 success:function(response){  
                    if(response.error == true){
                        alert('Ocorreu um erro: ' + response.msg);
                    }else{
                        alert('Pagamento efetuado com sucesso, um email foi enviado pra você com os dados do boleto. Obrigado pela compra.');                          
                    }
                }
            });  

In PHP that receives Ajax:

session_start();
require_once '../vendor/autoload.php';

PagSeguro\Library::initialize();    
PagSeguro\Library::cmsVersion()->setName("XXXXXXXXXXX")->setRelease("1.0.0");
PagSeguro\Library::moduleVersion()->setName("XXXXXXXXX")->setRelease("1.0.0");
PagSeguro\Configuration\Configure::setEnvironment("production");
PagSeguro\Configuration\Configure::setAccountCredentials("email.com", "XXXXXXXXXXXXXXX");
PagSeguro\Configuration\Configure::setCharset("UTF-8");
PagSeguro\Configuration\Configure::setLog(true, "pagseguro.log");

$sHash = addslashes($_POST["sHash"]);
$nome = addslashes($_POST["name"]);
$email = addslashes($_POST["email"]);
$ddd = addslashes($_POST["ddd"]);
$telefone = str_replace('-', '', $_POST["telephone"]);
$forma_pagamento = addslashes($_POST["form_pg"]);
$cep = str_replace('-', '', $_POST["cep"]);
$rua = addslashes($_POST["street"]);
$numero = addslashes($_POST["numberHouse"]);
$complemento = addslashes($_POST["complement"]);
$bairro = addslashes($_POST["neighbordhood"]);
$cidade = addslashes($_POST["city"]);
$estado = addslashes($_POST["state"]);
$cpf_msk = str_replace('.', '', $_POST["cpf"]);
$cpf = str_replace('-', '', $cpf_msk);
$valor = addslashes($_POST["valor"]);


$boleto = new \PagSeguro\Domains\Requests\DirectPayment\Boleto();
$boleto->setReceiverEmail('[email protected]');
$boleto->setReference($_SESSION['user_dm']); 
$boleto->setCurrency('BRL');



$boleto->addItems()->withParameters(
    $_SESSION['user_dm'],//identificador do produto
    "Conta Premium", //Nome do produto
    intval(1), // Quantidade
    floatval($valor)
);

//Comprador
$boleto->setSender()->setName($nome);
$boleto->setSender()->setEmail($email);
$boleto->setSender()->setDocument()->withParameters('CPF', $cpf);
$boleto->setSender()->setPhone()->withParameters(
    $ddd,
    $telefone
);

//Send Hash e IP
$boleto->setSender()->setHash($sHash);
$boleto->setSender()->setIp($_SERVER['REMOTE_ADDR']);

$boleto->setShipping()->setAddressRequired()->withParameters('FALSE');

$boleto->setMode('DEFAULT');

//Registrar o pagamento e recebe a resposta do pagseguro
    try{
        $resposta = $boleto->register(\PagSeguro\Configuration\Configure::getAccountCredentials());              
        echo $boleto->getLink() //Já tentei de tudo pra pegar o link;      
         exit();
    } catch (Exception $ex) {
        echo json_encode(array('error' => true, 'msg' => $ex->getMessage()));
        exit();
    }

When I make the payment by boleto and go in the log file of pagseguro the boleto link is there. Thanks