To access your receipts and invoices, go to the Subscription page and scroll down to Billing History.
To download a receipt or an invoice for a specific transaction, click the PDF file icon next to it. You can also include additional information in your receipts and invoices by clicking Add Details.
If your purchase was via the Apple App Store, follow the instructions in this article: View your purchase history for the App Store
For purchases made via the Google Play Store, receipts are typically sent to the email address associated with the Google account. If you can’t find the receipt in your inbox, contact Google Support.
If your subscription has expired or your invoice isn’t available for download, contact Support for further assistance.