Question
Does anyone know what plugin Automattic uses for their eCommerce functionality in the MU installation of WordPress located on the free sub-domains at wordpress.com?
Please share where it is available, or if it even is available. I suspect that it might be proprietary, but if not, I like to try and follow Automattics lead when developing my own WP sites to ensure better long-term stability.
More Plugin Details
If you have a wordpress.com account, you’ll find the admin panel for the plugin here: {YOUR_USER_NAME}.wordpress.com/wp-admin/paid-upgrades.php. These two related resources are pulled from the wordpress.com source code:
There are also multiple references to the plugin in this .pot file… open the link in your browser and do an on-page find for: wpcom-billing.
Based on the above evidence, it appears that this eCommerce plugin resides in a directory called: wp-content/admin-plugins/wpcom-billing, but I’m also wondering if this could just be a modified version of the wp-ecommerce plugin.
According to Dion Hulse of Automattic: