You cannot use the data from one API call in another directly within the API Connector. However, you can sequence them inside any Workflow and use the response from the first call in the second one.

1 - In a Workflow, create an action to make the first API call.
2 - In any step after the first call, create another action to make the second API call and use the Token returned from the first call as a dynamic value for the second. Make sure the Private checkbox is unchecked for this to work.

Another way to do this is by saving the Token in the database and then using it in a later step for the second API call. If you choose to save it in the database, it is very important to review your app’s security rules.