Click the Payment tab. In the Payment section, under General, enable "Test mode". Do not forget to click save, otherwise test mode won’t be enabled! For more information please see the payment tab docmentation.
After that return to your store. Make sure you are still logged in as an administrator, otherwise you will not be able to see the PeachPay checkout button.
Locate the PeachPay button and click to begin a checkout. Notice as the window opens the test mode banner on top and around the checkout window.
Enter information as necessary, and to make a payment, use the
Card number 4242 4242 4242 4242 with any future date and CVC. (This purchase will appear in your dashboard so make sure to not actually fufill the order.)
You have made your first test purchase, congratulations! Now you can do whatever you want with this order. You can even test PeachPay refunds by going to the order, clicking refund, and using the refund through PeachPay option.