Hi Latha, There are situations where the refresh token might get invalidated. There can be a maximum of 25 valid refresh tokens per application at a time for an account. If this limit is reached, creating a new token automatically invalidates the oldest token without warning. That might be what's happening in your case. You can find more information about refresh tokens here <https://developers.google.com/adwords/api/docs/guides/start#refresh_token>.
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