The duration of the access token

Hi ThaiNguyen,

You need to "refresh" the access token using refresh token. 😉 Take a look here for additional info.

Hope this helps.

ThaiNguyen Здравко is correct, if you need access for a long period of time without the user present, you should request and use refresh tokens. For reference, Dropbox is no longer offering the option for creating new long-lived access tokens. Dropbox is switching to only issuing short-lived access tokens (and optional refresh tokens) instead of long-lived access tokens. You can find more information on this migration here.

Apps can still get long-term access by requesting "offline" access though, in which case the app receives a "refresh token" that can be used to retrieve new short-lived access tokens as needed, without further manual user intervention. You can find more information in the OAuth Guide and authorization documentation. There's a basic outline of processing this flow in this blog post which may serve as a useful example.