{
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  "usage_id": "USAGE-001",
  "subscription_line_id": "SUB-002-L2",
  "customer_id": "CUST-001",
  "subscription_id": "SUB-002",
  "charge_id": "CHG-API-CALLS",
  "quantity": 150000,
  "date": "2026-06-01T00:00:00Z",
  "unit_of_measure": "API Calls",
  "description": "June 2026 API call usage",
  "invoiced": false,
  "currency": "USD",
  "custom_fields": {
    "source_system": "api-gateway",
    "region": "us-east-1"
  },
  "created_by": "system@ordwaylabs.com",
  "updated_by": "system@ordwaylabs.com",
  "created_date": "2026-06-01T01:00:00Z",
  "updated_date": "2026-06-01T01:00:00Z"
}