About six months ago Xero has announced the new requirements for all apps that integrated with Xero to migrate to OAuth2. They require all certified Apps to migrate before Dec 2020. All other apps will be able to work until March 2021 after that Xero will seize all support for legacy OAuth1
Please check if any of your software products are integrated with Xero and not following the new guidelines yet. If that is the case, your software may not be able to conenct to Xero after March 2021
So far we have helped many NZ businesses to implement OAuth2 and stay with Xero. We would be delighted to provide our guidance and expertise to you. Reach out for assistance via our Contact page or phone and our friendly staff will get in touch soon.