AfterPay and ShopPay Installments are services that allow you to pay for your order with 4 equal payments made every 2 weeks, interest free. To use AfterPay or ShopPay Installments simply shop as usual and proceed to checkout and then choose AfterPay or ShopPay Installments as your payment method. You will be directed to their website to register and provide payment details. If you’ve used either of them before, just log into your AfterPay or ShopPay account.