Docs
How to add usage charges to an invoice
How to Close a Pending invoice
Articles & FAQNote : If you are using Product Catalog 2.0 with the new metered billing feature enabled, then it is possible to track the usage in Chargebee. Please refer to this link
Summary
Metered Billing is a feature that allows you to add usage-based charges to invoices, based on your customer's usage at the end of the term (by listening to the pending_invoice_created event). Chargebee allows you to add these charges to the invoice via non-recurring addons or the Add Charge option.
As the usage based charges will need to be accounted for outside of Chargebee, the recommended approach is to use this feature via our APIs.
Solution
To handle this, you would need to keep a record of the customer's usage at your end, and
All of the above API actions can be performed via the UI as well.
The charges can only be added to the invoice after it is generated in the Pending state, so if you track usage charges on a daily basis, it is recommended to consolidate these charges and add it as a single line item at the term end.