I can't find AfterPay on your siteUpdated a month ago

When you're ready to checkout, click the cart icon in the top left corner, then click the 'checkout' button. Scroll down the page until you see the Payment section, and then select 'AfterPay'. 

If you are checking out with ShopPay, you won't see that AfterPay option as ShopPay doesn't work with AfterPay. You will need to click 'check out as guest' or log in with your Voomie customer account to show the AfterPay option.