curl -X GET 'https://app.memorylake.cn/openapi/memorylake/admin/v1/billing/auto-topup' \
  -H 'Authorization: Bearer sk_xxxxxx'

{
  "success": true,
  "message": "Operation completed successfully",
  "data": {
    "amount": {
      "amount": 1999,
      "currency": "usd"
    },
    "enabled": true,
    "threshold_tokens": 1200000,
    "tokens": 1200000,
    "cooldown_until": 1,
    "last_topup_at": 1760000000
  }
}