Understanding Apple's In-App Purchase System for Account-Based Subscriptions: A Practical Guide

Understanding the iTunes Connect Guidelines for Auto-Renewing Subscriptions: Workarounds and Alternative Solutions

Understanding StoreKit and Payment Queue in iOS: Why `paymentQueue:updatedTransactions:` is Not Called When a Transaction Updates

Building a Mobile App for Selling Ebooks: A Comprehensive Guide to Apple's In-App Purchase Model and Alternative Payment Solutions.