Fails to integrate into WooCommerce 2.1.9; apparently no news from author on an update -- plugin abandoned.
The new working alternative based on the same system is here:
This plugin was absolutely perfect for the WP site I was building for my wife's small business, but it no longer works with the latest WooCommerce (2.1.0) and is no longer updated.
I strongly recommend using the following plugin instead, which was based on this plugin but is still being supported and works perfectly:
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