curl -X GET 'https://app.memorylake.cn/openapi/memorylake/admin/v1/billing/credit-balance/alert/events' \
  -H 'Authorization: Bearer sk_xxxxxx'

{
  "success": true,
  "message": "Operation completed successfully",
  "data": {
    "items": [
      {
        "balance_tokens": 1200000,
        "fired_at": 1760000000,
        "id": 1,
        "recipients": [
          {
            "status": "sent",
            "email": "alice@example.com"
          }
        ],
        "recovered": false,
        "threshold": {
          "type": "percent_used",
          "value": 1
        },
        "recovered_at": 1760000000
      }
    ],
    "continuation_token": "eyJvZmZzZXQiOjIwfQ",
    "total": 1
  }
}