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É necessário alterar o código nos métodos: setNotificationURL() e setReturnURL(), para que possam receber & na url:
DE:
$this->xml->InstrucaoUnica->addChild('URLNotificacao', $url);
$this->xml->InstrucaoUnica->addChild('URLRetorno', $url);
PARA:
$this->xml->InstrucaoUnica->URLNotificacao = $url;
$this->xml->InstrucaoUnica->URLRetorno = $url;
Como informado aqui: http://www.php.net/manual/pt_BR/simplexmlelement.addchild.php#112204