order transaction authorization code is null 交易授权码为空

[collby]

when i call shopify rest api /admin/api/2024-04/orders/450789469/transactions.json to get the transaction for order, some times the response that authorization code is null,but the param of pay status is success, i want to know how to happen the result, transaction authorization code is null, is null  represent that order pay transaction is invalid?
当我调用shopify接口获取订单的交易信息明细，发现交易授权代码为空，我想了解为啥这个值为空，但是状态是成功的，为空是怎么发生，是无效的交易信息吗？过期了或者作废，希望有关shopify技术支持能给我解答下疑问