paypal - Paypal billing agreement "expire"什么时候结算？

Question

我正在阅读 the spec of Paypal billing agreements .上面写着

A reference transaction must have occurred within the past 730 days because the ID may not be available after two years. The billing agreement ID does not establish a time frame. It is good until canceled by the buyer.

计费协议(protocol)是否会“过期”？它在创建 730 天后一定会“过期”吗？如果该协议(protocol)在 730 天内没有交易，它是否真的“过期”？

它究竟在什么情况下“过期”？

Answer 1

我最近在看这个，我在这里找到了答案(https://developer.paypal.com/webapps/developer/docs/classic/express-checkout/integration-guide/ECReferenceTxns/#id094TB0Y0J5Z__id094TB4003HS)。

1. 除非明确取消，否则计费协议(protocol)永不过期。
2. 引用交易在 730 天后过期。