Fatal error: Uncaught Exception: PagSeguroLibrary: cURL library is required. in C:\Apache24\htdocs\library\Zend\PagSeguro\source\PagSeguroLibrary\utils\PagSeguroHttpConnection.class.php:36 Stack trace: #0 C:\Apache24\htdocs\library\Zend\PagSeguro\source\PagSeguroLibrary\service\PagSeguroRefundService.class.php(59): PagSeguroHttpConnection->__construct() #1 C:\Apache24\htdocs\library\Zend\PagSeguro\source\examples\requestTransactionRefund.php(54): PagSeguroRefundService::createRefundRequest(Object(PagSeguroAccountCredentials), 'E505C18007B9440...', '1000.00') #2 C:\Apache24\htdocs\library\Zend\PagSeguro\source\examples\requestTransactionRefund.php(75): CreateRefund::main() #3 {main} thrown in C:\Apache24\htdocs\library\Zend\PagSeguro\source\PagSeguroLibrary\utils\PagSeguroHttpConnection.class.php on line 36