Does anyone know where to find an "in-app-payment" example? - iphone

In an application I am developing I need to integrate the In-app-purchase concept, I have read the apple documentation but still don't completely understand how to completely integrate the system and make the call.
Does anyone know if there is an example out there to help me put me on track?

Try this blog entry: http://blog.mugunthkumar.com/coding/iphone-tutorial-%E2%80%93-in-app-purchases/.
He goes through the steps required to add in-app purchasing.

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Getting Started With Twitter for iOS

For quite a while now, I've been trying to find a good way to simply post updates/photos to a user's twitter account via my iOS app. I've looked at ShareKit, but I really need to be able to design my own UI. Also, I've taken a look at MGTwitterEngine, but am unsure as how to implement it. Is there a "right" way to go about posting updates to Twitter with a custom UI on iOS?
Any help would be greatly appreciated. Thanks.
Given Apple's TWTweetRequest object, calls made to the Twitter service can now be orchestrated right through iOS without the need for an external framework or engine. Just look at the Twitter developer docs and make the calls you need, specifying the correct information in a dictionary for the process to complete successfully.

inapp purchase: trobule while implementing this

I am quite new to this in app thing,
I am completely lost while setting up things at apple developer website
can some body explain me some simple process to achieve this.
Regards
Ankit
A good place to start when it comes to implementing In-App Purchase would be Apple's own developer video on the subject.

EverNote Api for iphone

Hi I am using Evernote Api for iphone. I downloaded Api from developers site of evernote. But I dont know how to use it...Any one know about this or have any links or examples to understand this?
Adding iOS sample code is a top priority. In the meantime, please have a look at http://digitalpericope.net/?p=27, which might help you get started.

iOS In-App Purchasing step by step tutorial

Is there any step by step source code/video or any other kind of help to implement in-app-purchasing ? I have tried many tutorials but still i am not able to get perfect solution for the in-app-purchasing..
What is the use of shared secret key?
I think that the best guide ever is the official In App Purchase Programming Guide, since it's full of examples, piece of codes, hints and so on. Following and reading carefully the Guide will surely help you in writing a fully functional test project.
In the meanwhile you could want to look at the MKStoreKit v4 add-on for your project to help you handle your in-app purchases in a easier way.

iPhone - where can i find a sample of GKVoiceChatClient?

I want to be able to let users of my iPhone app communicate using the GKVoiceChatClient classes. The documentation for the 3.0 SDK is very vague and I don't see any good samples in the Sample Code either.
Can someone please tell me where I can find some working example of in-game voice using which I can learn how to use it!
Thanks.
You'll need an account on the Apple Developer forums, but I stumbled across this a little while ago. I don't know if its functional but comments further along in the thread lead me to believe it is.
Example in the Apple Developer forums
chris.