A site specific plugin is a way to add functions to your WordPress site that enhance your Shopp.
If you wanted to add a sample function in the past, then you may have needed to add it to your child theme’s functions.php file using an SFTP or FTP client (e.g. FileZilla, Cyberduck):
A site specific plugin is a better choice since your customizations via custom functions will be in organized in one location. Additionally, if you add your code through the WordPress Plugin Editor, then WordPress will check your code to ensure that it won’t cause any fatal errors and take your site offline.