At first you need to select Cart page and Post type for your product on settings page..
Adding price to product.
Activate the plugin through 'Plugins WordPress..
Create Cart page and use shortcode on this page.
Go to plugin settings page, select cart page and set post type of your product.
You can switch on Coupons in the cart on settings page.
Create coupons if you need, there are 2 types of the coupons fixed price and percent ..
If you want to use shortcodes editing the files you need to use this WP function do shortcode.
Example echo do shortcode minicart, you can put it sidebar or header buy button for single product buy button for category cart page..
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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