余额查询 /dashboard/billing/credit_grants

{
  "object": "credit_summary",
  "total_granted": 5,
  "total_used": 5,
  "total_available": 0,
  "grants": {
    "object": "list",
    "data": [
      {
        "object": "credit_grant",
        "id": "ed7b8ddc-3fc1-4fa4-97cb-18d026cc8521",
        "grant_amount": 5,
        "used_amount": 5,
        "effective_at": 1680480000,
        "expires_at": 1690848000
      }
    ]
  }
}