Hi @kdarcy ,
There is no credential type that supports a refresh token by itself. Looks like those oauth credentials in n8n handles the refreshing under the hood. If you need to pull out the actual access token for something like SOAP, then you can try looking at this question where I list 2 ways to go about it: Microsoft Ads API SOAP + n8n conflict - #5 by KhemOptimal
(Note; there may be a community node that you can use as well, but nothing I’ve treid.)
Khem