Subscription invoices and receipts are available from your account once a payment has been processed.
From sufapp.thesufferfest.com, select the letter icon in the top right corner, then choose Manage Subscription from the drop-down menu. This can also be accessed from the desktop app.
Scroll to the bottom of your account page to see past invoices. Click on the date and the invoice will open up automatically in a new browser window.
You can choose to view your invoice details, and download your invoice or receipt in .PDF format.
Please note that you can't select an invoice that has not been paid yet.
For Apple subscription receipts, please refer to your Apple ID account.