woothemes/woocommerce — pull request #1442 by thenbrent (2012-08-27 04:50:02+00:00)
Title: PayPal Prefix Fix

As mentioned in #1440, if a PayPal prefix is changed, IPN requests break for all existing orders - this fixes #1440.

It does this by using a new `woocommerce_get_order_id_by_order_key()` function to get an order ID from an order key, as this will never change.