虽然我的网站上没有提供任何修改按钮，但我一直在 PayPal 中收到 subscr_modify ipn 通知。用户是否可以在不访问我的网站的情况下通过他们的 PayPal 帐户更改订阅的日期或价格，或者这仅仅是由于用户更改地址等原因造成的？
最佳答案
PayPal 支持人员的回答:
In this case the user cannot change the amount or length of the subscription, they can however change the funding source or address associated with their account. Those actions will generate the subscr_modify IPN that you are receiving.
关于 Paypal 订阅 subscr_modify : what can a user change on their own?，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14492402/