Refresh Token Expiration and Automation

Hi everyone,

I understand that the refresh token is valid for 180 days. My question is, what happens after that period https://developer.constantcontact.com/api_guide/auth_overview.html#refresh-token ? I was wondering if I were to set up a cron job to update and validate the token, ensuring I get a new refresh token to extend its lifespan and will that work? What I am unclear about is if this is possible or are there some limitations I should be aware of.

My goal is to avoid requiring users to log in and obtain new tokens after 180 days. Any advice on best practices for managing token refresh and automation would be greatly appreciated.

Thanks!