Sales invoice | History - Show I.P. Address with date & time viewed
When a client opens an invoice or quote Xero shows the IP address of whom ever opened it and the time it was opened. This is especially helpful when multiple people have access to the invoices. It also shows that the client did in fact see the invoice especially when they claim they haven't. Handy tool for chasing payment

We appreciate your feedback on how we could improve new invoicing, and the details that would help you track when a customers has viewed your invoice. While recording I.P. address of when a user opens an invoice or quote you’ve sent isn’t in the plans right now, we’re continuing development in this space and our product teams would like to engage you all here to get a deepened sense of our invoicing users, for future improvements. If you'd be interested in sharing further feedback we have a survey you can fill in. We'd love to get your input.