## Documentation Index

Fetch the complete documentation index at: [/llms.txt](https://docs.m3ter.com/llms.txt)

Use this file to discover all available pages before exploring further.

Accounts do not belong to a Product to allow for cases where an end customer takes more than one of your Products, and the charges for these Products differ. You typically attach a priced Plan or Plan Template to an Account before you can generate bills for the Account:

- If a customer consumes several of your Products, you can attach a priced Plan or Plan Template to the Account for charging against each Product.
- If an Account is charged solely on the basis of an agreed Prepayment/Commitment amount but not all of the Prepayment is prepaid, you can use a customized billing schedule for outstanding fees without having to attach a Plan to the Account to generate Bills.

You can create Child Accounts for end customers who hold multiple Accounts with you. You can then set up billing for the Parent/Child Account usage to have the end-customer billed once for the Parent Account, instead of having separate bills issued for usage against each of their multiple Accounts.

**IMPORTANT! - use of PII:** The use of any of your end-customers’ Personally Identifiable Information (PII) in m3ter is restricted to a few fields on the **Account** entity. Please ensure that only the `name`, `address`, or `emailAddress` fields contain any end-customer PII data on any Accounts you create. See the [Introduction section](https://docs.m3ter.com/api) above for more details.