Welcome to the Community. Let me share information about the receipt in QuickBooks Online.
To begin with, please know that the Receipt feature is free as long as you have a QuickBooks Subscription.
If you want to add a receipt in QuickBooks Online, you can sync your accounts, snap photos of receipts using the mobile app, and upload them to QuickBooks. The app extracts information from receipts and creates transactions for you to review. If you invoice clients for expenses, you can attach receipts to invoices and record billable expenses in your books.
For more details about uploading receipts to QuickBooks Online from your computer, mobile device, or email account, please refer to this article: Upload your receipts to QuickBooks Online.