---
title: Testing transaction observer code
framework: storekit
role: article
role_heading: Article
path: storekit/testing-transaction-observer-code
---

# Testing transaction observer code

Verify that your app activates its payment transaction observer by using breakpoints.

## Overview

Overview Review the transaction observer’s implementation of the SKPaymentTransactionObserver protocol. Verify that the SKPaymentTransactionObserver listens for transactions when: Your app isn’t displaying its store UI If you didn’t recently initiate a purchase Locate the call to the add(_:) method of SKPaymentQueue in your code. Verify that your app calls this method at app launch. For more information, see Setting up the transaction observer for the payment queue.

## See Also

### Transaction observer

- [Testing a successful transaction](storekit/testing-a-successful-transaction.md)
- [Testing complete transactions](storekit/testing-complete-transactions.md)