You can use this library for login,for logout just call mApp.resetAccessToken(); https://github.com/thiagolocatelli/android-instagram-oauth and for webview.use below properties for clearing webview sessions and data. WebSettings mWebSettings = webview.getSettings(); mWebSettings.setSavePassword(...
(3) When you create a new user, create a secret for just that user, then you can sign every user token with that specific secret, and just like in (2) events like changing password, logout from all devices etc, Should create a new secret. This way also you can invalidate by checkin...
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