[urbanjunkie]

Although the immediate parent is being downvoted, it's actually interesting to understand why Apple have allowed this without collecting a % of the transaction fees that Square receives.

Or perhaps they are collecting a (lower?) percentage.

[thatjoshguy]

From what I understand In-app purchases (where Apple gets a 30% cut) are only required when the item is only for use from within the app (virtual currency, level packs, digital subscription etc). Purchasing a physical items does not require transaction to use Apple's IAP API. In fact, it is expressly forbidden.