Post Malware, Plugin Not working

We had some issues with malware last week. i have the site back up, but WP Payeezy Pay is not working properly.

Getting the following error:

Warning: file_get_contents(http://metrocarbonic.com/wp-content/plugins/wp-payeezy-pay/css/stylesheet.css): failed to open stream: HTTP request failed! HTTP/1.1 400 Bad Request in /data/18/4/100/139/4426302/user/5182172/htdocs/metro3/wp-content/plugins/wp-payeezy-pay/wp-payeezy-pay.php on line 117

Example Here: http://metrocarbonic.com/pay-online-2/