Sometimes I see in my log: "invalid_grant: Sorry, your OAuth grant has expired".
First my idea, that's because user revoke permissions in `Podio > Account settings > External app permissions`. I try reproduce it and success i see "invalid_grant: Sorry, your OAuth grant has expired". Ok first reason is found and clear.
After that i goes to google and search "Sorry, your OAuth grant has expired" and I found problem with refresh_token after 28 days, here: https://help.podio.com/hc/en-us/community/posts/206669587-Get-new-refresh-token?Page=1#community_comment_4402778503954 All posts is outdated, and has no answer. Developer docs has no information about "refresh_token" expiration.
Ofcource I update access and refresh token on my side when call "/oauth/token", but some my clients can idle more than 28 days and I want know are they will have problems with access or not.
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