When ever you need to let Rex access the Xero integration, you need to give Rex authorisation. Because of the security levels when dealing with Xero, you'll need to authorise it once every 30 minutes while using the integration. This will only appear when needed.
Simply:
- In the new Authorise popup, click Xero | Authorise Application.
- Enter your login details for Xero.
- Click Login - once you've done this, go back into the Rex window and continue.
