How to add the Xero app
When creating the Bot (or in the Apps tab), open the Apps drop-down menu, select “Xero” under “Add New App” and click on connect to continue.
In the pop-up window, click on Allow Access button to give access for Xero account with your valid username and password, Click on Save button to save the App.
Resolving Authentication Errors
Sometimes you may see authentication errors (screenshot below) when you change your Xero password.
You may encounter these errors either while creating the Bot, or enabling the Bot.
To resolve this issue, you will need to re-connect your Xero app.
Go to Apps list, and hover on the Xero app, and click on the icon that says 're-connect the app'
A new pop-up window opens up, allowing you to re-authorize access to your Xero account. Finish the authorization and save the app.