Possibilities for physical goods and services purchase on Apple and Android

Question

What are the best ways to purchase various physical goods, delivery and printing services, tickets, etc. on iPhone and 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

Answer 1

I've personally really enjoyed using Square.