The Who Bought What report (accessed via Store administration|Reports|Who Bought What or http://www.openvpms.org/admin/store/reports/uc_who_bought_what ) is very useful.
You can select the products to be reported as follows:
Note that the 'Subscription Key' product will show the $0 orders created just to generate keys for customers, and thus provides a track of the cases where the key was sent out independently of the customer's purchase of an Annual Subscription.
The Development Project Donation shows donations to projects and can be used to track both payments and pledges (which will be shown with HowPay as 'other').