After you set up Shop Pay, you will see the option to pay in installments with Shop Pay at checkout with an eligible order. If you haven’t added a debit or credit card to your Shop Pay account, you can do so during checkout and it’s saved for future purchases.
Affirm's underwriting systems determine whether your first payment is due at checkout or 2 weeks after your purchase. The next 3 remaining installments are automatically charged to your card saved on Shop Pay every 2 weeks.