How can I download receipts for past payments?

If you have a Professional subscription and need to download receipts for previous payments (eg if required for tax purposes) you can log into your account settings, scroll down to the 'Other Account Actions' section at the bottom of the right hand column, and click 'View Receipts', then choose the receipt you want to view. When you are viewing a receipt you will also find a link that will allow you to download it as a PDF.