The 12 checkout optimizations that actually move conversion

We A/B tested every checkout pattern across 84 Shopify Plus stores. Here are the dozen that consistently lifted CR by double digits.

Most checkout advice on the internet is recycled from 2018. Apple Pay buttons. Trust badges. Progress bars. The actual unlock for modern Shopify Plus is somewhere else entirely — and it took us 84 stores and roughly 1,200 A/B tests to figure out where.

This is the short version of our internal checkout playbook. We’ve stripped the brand-specific stuff and kept the patterns that hold across categories.

1. The express row, but actually optimized

Everyone runs Apple Pay + Shop Pay + Google Pay. Almost nobody orders them by your customers’ actual device mix. We sort the express row dynamically based on User-Agent and saw a +6.4% lift in completed checkouts on the average store.

2. Address autocomplete that doesn't suck

Shopify’s default address autocomplete is good enough for the U.S. and brutal everywhere else. We replace it with a custom Loqate integration on every Plus build. The result is a 3-4% completion lift, almost entirely from international customers who otherwise abandon.

If you only do one thing from this list, do address autocomplete. The ROI is absurd.

3. Smart payment retry on hard declines

About 7% of card declines are recoverable in real time. We wire up a server-side flow that retries with a slightly modified network token before showing the error. Stores running this recover roughly 1 in 14 declines, no friction added.

4. Persistent cart across devices

Customers research on mobile and buy on desktop. The default Shopify session-cookie cart breaks this. We build a customer-bound persistent cart on every Plus build, which alone tends to lift attributed conversion by 2-3%.

The other 8

• Inline shipping calculator on the cart drawer — preempts the #1 abandonment reason.
• One-tap discount surfacing when a code exists in the URL or in flow context.
• Trust copy near friction, not at the top — return policy next to the pay button, not in the footer.
• Smart bundling at the product page, not the cart — bundle attach rate doubles.
• Aggressive form pre-fill from address books, autocomplete, and previous orders.
• Klaviyo-attributed dynamic free shipping threshold — don’t show "free over $75" if their cart is at $73.
• Post-purchase one-click upsells with smart caps to avoid customer complaints.
• Branded order confirmation — your last touchpoint should look like the rest of the brand.

The meta-lesson

Checkout optimization isn’t about adding things. The single biggest unlock across all 84 stores was removing fields, not adding them. Every form field you remove is worth roughly 1% of completed checkouts. Audit yours.