Urban Airship looks like a great all-in-one solution if you’re interested in doing push notifications and in app purchases but don’t want to run your own server. Their product pages are heavy on the marketing-speak, but it looks like a solid product with a decent library and API.
Beware, though. As if depending on Apple isn’t enough, now you’re putting a pretty important user engagement process in the hands of a third party. Weigh that carefully. I’ve recommended this to some clients, though, because it was simpler than having to support their own servers.
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