Trying to Unsync App does not Actually Disconnect App

Sometimes when trying to unsync an App in the marketplace, we've found that it does not actually unsync. Why is that and is there a fix for this?

In custom marketplace implementations using the Apps.json endpoint, there are times when an app may not successfully unsync.

This is the result of a browser caching issue when the syncing and unsyncing happens repeatedly within a short period of time. When this happens, the browser automatically redirects the user back to your specified "redirect_uri" parameter without passing a request first to the Validic API. To work around this, you may add a new parameter to your "sync_url", "unsync_url", and "refresh_url" which would differentiate the URLs from the previous ones cached by the browser, for example:

GET ORGANIZATION_ID}/auth/{SOURCE}?user_token={USER_AUTHENTICATION_TOKEN}&format_redirect=json&timestamp={EPOCH_TIME}&redirect_uri={URI}

In the example above, adding a new "timestamp" parameter with the value of the current time in epoch makes sure that each time the App Marketplace is rendered, a different URL is served to the browser. You may alternatively provide a different parameter and value so long as this is always unique from the previous one.