QQ mailbox reminds Alipay to issue invoices. What happened?

Someone else registered Alipay with your email address.

If I didn't do it, I suggest unbinding. You can close the case casually, but it doesn't rule out that someone else got off Troy's horse, or you can hand it over to the police. This is the most appropriate method.

FB transaction information cannot be cancelled, because Alipay is bound to the mailbox, so you can go to the mailbox to disable the information of Alipay system. Or close the Alipay service reminder.