I have tried several ways of initiating the MP Cart class and trying to call the floating_cart_html() function so as to have it on all pages of my website like in class-mp-cart.php
add_action( 'wp_footer', array( &$this, 'floating_cart_html' ) );
The not having an easy option to include the floating cart in every page on the website is absurd. The shopping cart widget that you have isn't anything like the floating cart that is already available and should be available as an option or at the least only require a few lines of code to implement. That's a standard feature for a shopping cart.
I know there is a learning curve, but your documentation is severely lacking. With that said, I do love the automate, hummingbird, defender, and smush products and ability to send out reporting.