Description
Amazon SNS uses the publish/subscribe model for push delivery of messages. Recipients subscribe to one or more 'topics' within Amazon SNS. Typically, this is hidden from the user as an internal part of a mobile app. Receipt of a message may also be hidden from the user: this service is largely aimed at the internal processing of specific apps rather than as a generic email substitute. A game might receive bonus-level announcements or unlock keys for in-game purchases by this route. A ticket booking app could use it for confirmation vouchers, boarding passes or notifications of a delay to a flight. The first 1 million Amazon SNS requests per month are free, and $0.50 per 1 million requests thereafter will be charged as per the latest costing structure. Pricing varies according to the delivery mechanism: there is a charge to request a message ($0.50 /million) and a varying charge for how (and if) the recipient chooses to receive it. HTTP is cheapest for retrieval ($0.60 /million), email is around 30 times this ($20 /million) and SMS considerably (hundreds of times) more ($7,500 /million). Like most cloud services, initial access costs are kept low and there are no sign-up or subscription charges.References
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