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\PagSeguroPreApprovalService.class.php(200): PagSeguroHttpConnection->__construct() #1 C:\Apache24\htdocs\library\Zend\PagSeguro\source\examples\preapproval\cancelPreApproval.php(46): PagSeguroPreApprovalService::cancelPreApproval(Object(PagSeguroAccountCredentials), 'E48DD6BD353560C...') #2 C:\Apache24\htdocs\library\Zend\PagSeguro\source\examples\preapproval\cancelPreApproval.php(68): CancelPreApproval::main() #3 {main} thrown in C:\Apache24\htdocs\library\Zend\PagSeguro\source\PagSeguroLibrary\utils\PagSeguroHttpConnection.class.php on line 36