If Xero users are required to authenticate their logins it would make a lot of sense for invoices sent from Xero to require authentication, or another layer of security before they can be viewed. Whether its a code sent via SMS or an app, it would set Xero apart from a security standpoint for customers to know that if an email account of an invoice recipient is compromised there is still one further step stopping them from accessing an invoice template.
If Xero users are required to authenticate their logins it would make a lot of sense for invoices sent from Xero to require authentication, or another layer of security before they can be viewed. Whether its a code sent via SMS or an app, it would set Xero apart from a security standpoint for customers to know that if an email account of an invoice recipient is compromised there is still one further step stopping them from accessing an invoice template.