Possibilities for physical goods and services purchase on Apple and Android

What are the best ways to purchase various physical goods, delivery and printing services, tickets, etc. on iPhone a开发者_开发百科nd Android platform? Since, both Apple In-app purchase and Android In-app billing are limited to digital content purchase consumed within the application, what 3rd party possibilities we have and what are your experience?

1. Premium SMS (Disadvantage: price limitations, MNO shares about 40-50% or more)
2. PayPal API (Disadvantage: not everybody is using that)
3. redirection to payment (credit) card gateway (e.g. 3D Secure) - added later

Anything else?

Thanks STeN

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Added later: For more information see also this: In App Purchase

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I've personally really enjoyed using Square.