Okay you got me confused now… are you using the WP eStore plugin or the Simple PayPal shopping cart plugin?
The forum post is under WP eStore but the shortcodes and functions you are using are for the simple PayPal shopping cart plugin.
Also the correct shortcode is:
[wp_cart:Daddy’s-Cherry-Delights:price:17.00:shipping:12:00:end]
not sure why you have the text “left_bracket2” in there.