Shortcodes used in WHMCS Integration

I recently installed the WHMCS WP Integration plugin on my website and LOVE it. Thank you very much. I was wondering if the shortcodes listed is the extent of the functionality that I can integrate within my website. I offer web hosting as well as domain registration and was wondering if there was a way to create my own shortcodes so I can implement these products in various areas of my site, without the user being redirected to the WHMCS portal and losing my branding. Is that what the "URL Encoder" is for?

Thank you again.

Tom - TG-Innovations