Head to account settings by clicking the circle with your initial in it.
Click on "Account" from the dropdown
Once you're on the account page, click the "Billing" tab.
Once you're on the billing tab, click the "Manage" button.
The "Manage" button opens the subscription portal where you can find your past invoices.
Click the icon next to the date to open that specific invoice.
Click the download button to save the invoice to your computer.
It will download as a PDF file.