你可以通知银行，允许第三方从你的账户取款。
You can instruct your bank to allow a third party to remove money from your account.
只有过滤器允许的通知才可被传递到侦听器。
Only notifications which the filter allows are passed to the listener.
订阅筛选器，允许订阅器定义通知使用者感兴趣的主题列表。
Subscription filter allows subscriber to define a list of topics that a notification consumer is interested in.
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