It would be nice if you could add SSO to Dear and add it to Google Market place. This would give a single login for Xero and Dear and other apps (and it may get you more customers).
This would be a huge security feature for businesses in the Google Suite
If you can't integrate with Google, then more security features are a must. With today's security concerns, 2-step verification is a software standard... But I would figure Google Integration is much easier.