To pay with Shop Pay Installments online: Fill your cart, then choose Shop Pay at checkout. Choose to pay in installments and tap Continue. Select the installments option that best suits you. Choose a debit or credit card to use for payment, then tap Continue. Follow the steps to verify your identity—this usually takes just a few moments. If you agree to the terms, click Agree, then tap Authorize purchase. Enter the 6-digit verification code that was sent to your phone.