About Access Tokens
The OAuth configuration consists of three entities within Jira and Issue to Page:
The access token stored by Jira
<Your Jira URL>/plugins/servlet/oauth/users/access-tokens
The Jira application link that you created during the setup process
<Your Jira URL>/plugins/servlet/applinks/listApplicationLinks
The token data stored by Issue to Page for use when accessing the REST API
<Your Jira URL>/secure/IssueToPageOAuth!default.jspa
Issue to Page will show you that it has this data with the following message:
If you revoke or delete any of these, you will need to reconfigure the connection as described here.