There aren't so much living example how to verify receipts of In-App-Purchase locally preferably in Swift. Some how, reusing the same verification code are not recommended for security reason. Therefore, it is hard to implement whole set of receipt verification code in your hand. This slide is not intended for encouraging write less secure code, but guide you how to implement a whole set of verification code in Swift. You may have to consider how to make your code to become more secure before your releasing day.