Storing refesh token with access token

I'm woking with an API that uses OAuth 2 and a rediculously short token expiry period. Part way through getting the data the access token expires and I need to refresh it.

A refresh token is provided at the same time as the access token. It's important this is used as without it a new token has to be issued that would require a user to login which doesn't work mid data processing. Is there anyway to store this refresh token in metadata.account so it can be used in the middle of getting data?