Post-purchase upsell
A one-click extra offer shown after the main payment, using the saved payment and delivery details instead of another checkout.
See it
What it is
A post-purchase upsell is a focused extra offer shown after the original payment succeeds. The shopper accepts with one click because the store already has a reusable payment method and delivery details. The extra may become a second charge and a new line on the order, depending on how the commerce platform models it.
Reach for it when the add-on is easy to understand and does not need to interrupt the main checkout: spare filters after an air purifier, or a second item at a clear discount. Show one offer, state whether it ships with the first order, and provide an obvious decline action that leads straight to the receipt.
Gotcha: one click is not a promise that every card can be charged silently. Banks can require fresh authentication, and the extra charge can fail after the main order is already paid. Never roll back or hide the original confirmation; handle the upsell as an independent attempt and show its outcome plainly.
Ask AI for it
Build a single post-purchase offer after the paid order confirmation. During the original Stripe PaymentIntent flow, collect explicit consent to save the payment method and set `setup_future_usage: 'on_session'`, since the shopper is still present when the upsell is charged. Show one complementary product with image, variant, discounted price, shipping impact, an 'Add to my order' button, and a clear 'No thanks' link. On acceptance, create a separate idempotent PaymentIntent with the saved `customer` and `payment_method`, and set `confirm: true`; then add the item to the order only after that payment succeeds. If Stripe returns `requires_action`, open the required authentication flow; if it fails, leave the original paid order untouched and show a route to the normal checkout. Expire the offer after 15 minutes and never delay access to the receipt.