in which situation will refresh token expire？

[xujia...@gridsum.com]

in which situation will refresh token expire？

[Umesh Dengale]

Hello,

The refresh token is specific to a user of your application. It should be treated as a credential of the user and stored securely. Save refresh tokens in secure long-term storage and continue to use them as long as they remain valid.
Refresh tokens can become invalid for a few reasons:

• There is a maximum of 25 refresh tokens that can be valid at a time. If someone gets a 26th refresh token, then the 1st refresh token becomes invalid.
• Refresh tokens can also be manually revoked. If someone left the company, then they might have done so.

 Please check token expiration section of the OAuth2.0 guide for more details.

Thanks,

Umesh, AdWords API Team.