integrate Appian with Adobe through OAuth 2.0 authorization code grant.

We are trying to integrate Appian with Adobe through OAuth 2.0 authorization code grant.

We have used Appian Out of the Box Connected system and able to authorize Adobe. However, the site can give me an access token (valid for 60 minutes). We need manually authorize every 60 minutes to keep the connection active.

Adobe team asked us to use Refresh token to get automatically authorize. Appian doesn’t have any Out of the Box solution to address this issue.
We tried using integration object to get tokens. But we didn’t find proper documentation to achieve using integration object.
We want a plugin or sample application where Refresh token can be used without manual intervention.