Best practice to catch "Access token is unknown or invalid"

[Rory Burke]

I have a process that is running once an hour, every so often it runs into an expired token and that run fails. The next run works fine as the prior one served to renew the token.

What I'd like to do is add in some logic to check that the token is live, and if so proceed. If it's not, it should renew and then proceed. I'm just not sure how to go about adding this check.