I'd like to use the iPhone SDK Store Kit but you are not allowed to use it for purchasing real world goods and services or for transferring money, my customer's applications require these.
So I'm looking into adding views to my application to gather credit card details then use https posts in a background thread to communicate with a payment processing provider. Does anyone know if this would get my 'app' rejected by Apple?
I've seen a number of Apps on the App store that allow a user to buy real world goods using the application, however, they use their OWN services/UI to do this.
As you noted, you can't use In App Purchase to pay for real world goods. You shouldn't have any problem submitting an app that allows a user to pay for real worlds goods as long as you're using your own services and UI and it's secure.
Amazon and possibly other apps do this. So you can also do this. What you need to ensure is already discussed in previous answers.