// Reserve spend before the workload creates cost.
const { result, error } = await unprice.runs.start({
  customerId: "cus_1234567890",
  budgetAmountMinor: 5000,
  idempotencyKey: "run:req_123",
  workloadType: "workflow",
  workloadId: "wf_summary_123",
  traceId: "trace_123"
});

if (error) {
  console.error(error.message);
  return;
}

// A running run means the budget reservation was accepted.
console.log(result.runId);

{
  "runId": "brun_123",
  "status": "running",
  "customerId": "cus_1234567890",
  "budgetAmountMinor": 5000,
  "consumedAmountMinor": 0,
  "remainingAmountMinor": 5000,
  "currency": "USD",
  "workloadType": "workflow",
  "workloadId": "wf_summary_123",
  "traceId": "trace_123",
  "parentRunId": null
}