General:
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Forums topic: StoreKit
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Forums tag: In-App Purchase
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In-App Purchase documentation
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Getting started with In-App Purchase using StoreKit views documentation
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Supporting business model changes by using the app transaction documentation
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Testing at all stages of development with Xcode and the sandbox documentation
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App Store Server Notifications documentation
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App Store Server API documentation
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Simplifying your implementation by using the App Store Server Library documentation
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TN3185: Troubleshooting In-App Purchases availability in Xcode technote
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TN3186: Troubleshooting In-App Purchases availability in the sandbox technote
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TN3188: Troubleshooting In-App Purchases availability in the App Store technote
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Understanding StoreKit workflows sample code
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Implementing a store in your app using the StoreKit API sample code