The Usage Activity is a feature that will track all your usages be it the number of phone units used on calls, number of employees..etc and can be used across multiple verticals and platforms
5.21 Usage Activity Upload : The Usages can be uploaded using a .csv upload
5.22 CSV File API for Activity Batch Processing : The usages can be uploaded using the API as well.
5.23 Usage Activity using UI : The usages can be manually filled in using the UI