In-app purchasing is increasingly the preferred mechanism for monitising mobile apps. IAP remove barriers to purchase as the user is not confronted with any kind of payment wall, they don’t need to enter additional login details or credit card numbers, and the transactions all go via a provider that they already know and trust with their money.
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Apple started the party but IAP is now available to developers and publishers of via Amazon and Google for the non iOS platforms but things are not as straight forward as they could be.
This post (The problem with in-app purchases) highlights some of the things to be aware of when considering using IAP.