BuffMoney
Developers start with one usage event.
The core model is simple: Usage Event, Billable Metric, Invoice, Payment Order, FX Snapshot, Ledger, and Settlement Batch.
Usage Event API
POST /api/v1/usage-events
Authorization: Bearer bm_live_xxx
Idempotency-Key: evt_20260521_0001
{
"customer_id": "cus_cn_001",
"metric": "tokens_output",
"quantity": "60000",
"occurred_at": "2026-05-21T10:30:00Z"
}