The app refreshes points when you move to a different tab within the app, or in most cases when you close the app (not just minimize on your phone). It will also log you out when you close the app. It will not log you out when you minimize the app, or have it running in the background. Sometimes there is a delay between when you redeem online and when that change is reflected in the mobile app. Also keep in mind that your Buzz Points do not show up instantaneously. Your Buzz Points will be updated within 2-3 days after the transaction posts and settles on the account.