How to implement with Popsicle?

I was able to successfully get a token with owner.getToken() and createToken as well as refresh the accessToken with a refreshToken. I am not very savvy in NodeJS yet but I was wondering how would I use the accessToken with Popsicle to generate a POST ?

Do I need to put a check to verify the token has not expired or is that within the library? If the Token expires will it auto generate a new accessToken based off the refreshToken?

Thanks