Report usage and optionally charge user

Reports usage data and optionally charges the user. This is the main endpoint for tracking AI agent usage.

Charging Users:

• Set chargeUser: true to charge the user for the usage
• When charging is enabled, the user's billing account will be charged the totalCost amount
• Use the preview endpoint first to check if the charge will succeed

Authentication Required:

• Client Credentials (Basic Auth)
• OAuth Access Token with usage_reporting permission
• OAuth Access Token with payment permission (when chargeUser: true)