> ## Documentation Index > Fetch the complete documentation index at: https://docs.stigg.io/llms.txt > Use this file to discover all available pages before exploring further. # Overview Charges refer to the line items that customers will be billed for when subscribing to this plan. This can be a recurring fixed fee, based on usage or using a combination of both. To add a charge, first select the charge type: 1. [Base charge](./base-charge) 2. [Usage-based charges](./usage-based)