Recommended resources for In-App Purchase:
Documentation
- App Distribution Guide
- In-App Purchase Best Practices
- iTunes Connect Developer Guide
- In-App Purchase Programming Guide
- Receipt Validation Programming Guide
- Getting Started with In-App Purchase on iOS and OS X
- In-App Purchase Configuration Guide for iTunes Connect
- Technical Q&A, QA1329, 'In-App Purchase Product Identifiers
- Technical Note, TN2259 Adding In-App Purchase to your iOS and OS X Applications
Sample Code
WWDC Videos
- WWDC 2012: Selling Products with Store Kit
- WWDC 2013: Using StoreKit for In-App Purchases
- WWDC 2012: Managing Subscriptions with In-App Purchase
- WWDC 2013: Using StoreKit for In-App Purchases
- WWDC 2013: Using Receipts to Protect Your Digital Sales
- WWDC 2014: Optimizing In-App Purchases
- WWDC 2014: Designing a Great In-App Purchase Experience
- WWDC 2014: Preventing Unauthorized Purchases with Receipts