A list of applications you can integrate is available here.
To learn what integrations are and what apps you can integrate click here.
To prioritize tokens, you need to have an API token created. How to create your own token can be found here. Token prioritization only affects the overwriting of the data, so it has no effect on creating data. Therefore, it only affects "update" scenarios. You can see how the prioritization works + the data consolidation process in the tutorial below.
ALERT! Tokens do not affect the manual overwriting of data in the system. Data can always be overwritten manually.