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cURL is a PHP library used by many PHP applications to communicate with the eBay API.
To use the cURL library, the cURL extension must be enabled in your PHP setup.
On Windows, this typically means you just have to uncomment the cURL extension in the php.ini file. In the listing below, remove the leading semi-colon before extension=php_curl.dll to enable cURL.
From php.ini :
; Be sure to appropriately set the extension_dir directive. ;extension=php_mbstring.dll ;extension=php_bz2.dll ;extension=php_curl.dll
C:\>php -i | find /i "php.ini" Configuration File (php.ini) Path => C:\Programs\php\php.ini C:\>
C:\> php -i | find /i "curl" curl CURL support => enabled CURL Information => libcurl/7.14.0 OpenSSL/0.9.8a zlib/1.2.3 C:\>