> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.orbitdev.org/llms.txt
> Use this file to discover all available pages before exploring further.
# Advertising Billing: Micros, Charge Points, and Ledger
> Understand Orbit's micros money model, CPM/CPC/CPA charge points, transactional billing, fraud handling, and the advertiser ledger system.
Orbit Audience Engine stores all monetary values as integer micros. This page explains the money model, when charges occur, how fraud is handled, and how to read the advertiser ledger.
## Micros money model
Money is stored as integer micros. One whole unit equals 1,000,000 micros.
Example: 1 USD = 1,000,000 micros. A CPM bid of 5.00 USD is stored as `5000000` micros.
## Charge points
| Model | When charged |
| - | - |
| CPM | At impression creation |
| CPC | On eligible unique click |
| CPA | On eligible idempotent conversion |
## Transactional charge steps
Each charge follows these steps in a single database transaction:
1. Lock the campaign and balance row
2. Verify daily and total budget limits
3. Verify available organization balance
4. Update campaign spend
5. Update organization balance
6. Insert an immutable ledger entry into `advertiser_transactions`
## Fraud handling
Fraud-flagged activity remains measurable but is not billable. Examples include sub-350ms clicks and duplicate clicks, which the Advertising API flags as suspicious.
## Advertiser ledger and balances
* `advertiser_transactions`: the immutable ledger for deposits, charges, and refunds
* `advertiser_balances`: the current organization-level balance
## Funding
Production funding and invoices attach to Orbit's existing Stripe architecture. No second payment provider is introduced.
Specific pricing, minimum deposits, and invoice schedules depend on your Orbit agreement. Contact your account representative for details.
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