Post-Purchase Upsell Timer & Tracker

I'd build a post-purchase extension that renders a modal right after order confirmation, with a countdown timer that expires the offer if the customer doesn't act in 30 seconds. The extension would pull the order contents, pick a complementary product on the fly, and fire a custom event to Klaviyo whether they accept or decline—so the merchant can sequence follow-up campaigns based on what happened in that moment.

A mid-market DTC brand wanted to capture incremental revenue by presenting a complementary product offer immediately after checkout, with urgency built in via a 30-second countdown. They needed the upsell decision (accept or decline) tracked back to Klaviyo so their email team could segment customers based on offer engagement.

Four pieces

Checkout & Conversion

Post-Purchase Extension

Renders an upsell modal that appears right after a customer completes checkout, with full access to their order.

Checkout Extensibility, React

Checkout & Conversion

Countdown Timer & Offer Gate

A 30-second countdown that expires the upsell offer and closes the modal if the customer doesn't act in time.

React state, useEffect

Checkout & Conversion

Dynamic Product Recommender

Picks a complementary product based on what categories or product types are in the order, then fetches its price and image.

Storefront API, React

Customer Data

Upsell Event to Klaviyo

Fires a custom event to Klaviyo when the customer accepts or declines the offer, tagged with the offer ID, product, and order ID.

Klaviyo API, custom event

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