Answer
STAFF
Sam Wierema
21-Jan-2011 04:13:22
If you are a Featured User you can find your invoices on your Featured User report page (the link is in your signup email). Click on the "Manage subscriptions" tab to see your current subscriptions and invoices.
If you are a Premium subscriber you can find your invoices on the Settings page http://twittercounter.com/pages/settings/premium.