An API Token is unique to a user, and each user can only have one API token. This is worth bearing in mind if you are using the API token for another integration. In this case, you will need to use the same token for Avion, or generate a new token and update relevant services.
If your API token becomes invalid and you try to make an update to an item in Avion that triggers a ZenHub update, we will warn you of the failing token. To fix this, you can head to the integration Configuration panel in Avion and update the token.