Shopify thank-you page customization missing — Checkout Extensibility thank-you additional scripts or UI not showing (Plus).

Several products can look like “nothing after checkout.” They do not share a settings panel. This page is only when Shopify thank-you page customization / Checkout Extensibility thank-you additional scripts or UI is not showing — Plus, app, published thank-you / order status profile. A Plus post-purchase one-click upsell page that never loads is post-purchase page not loading. A blank / spinning order status or thank-you tracking page is order status page blank. A checkout UI extension / extensibility app block during checkout (payment step) is checkout UI extension not loading. Checkout Branding API / checkout editor branding (logo, colors, tokens) is checkout branding API not applying. Related third-party thank-you upsell apps that fail after payment: thank-you page upsell broken. This page is only: Shopify thank-you page customization missing (Checkout Extensibility thank-you additional scripts / UI — Plus).

Six ordinary reasons thank-you customization stays missing: shop still on legacy checkout.liquid additional scripts instead of Checkout Extensibility thank-you surfaces; thank-you / order status app installed but not on the published checkout profile; extension target wrong (checkout UI during payment vs purchase.thank-you / order-status); script blocked by Customer Privacy / consent; draft profile edits while buyers hit published; you tested post-purchase, blank order status HTML, checkout UI, or Branding API and called it “thank-you customization.” Walk them in that order. You already pay for Shopify Admin. You do not need another SaaS to prove why the script or UI is absent.

Open Settings → Checkout and complete a live paid checkout (not only Theme editor or draft profile preview) side by side. Capture: Checkout Extensibility live — not a legacy checkout.liquid “additional scripts” path you thought still ran; thank-you / order status apps or UI extensions on the published / live checkout profile, not a draft; Admin shows the customization enabled while a paid order’s thank-you never renders the script or block.

Screenshot Admin thank-you / order status placement vs the buyer journey after Pay now. If the Plus post-purchase one-click upsell page is missing but thank-you is fine, leave this page and use post-purchase page not loading. If thank-you / order status is blank or spins with no content at all, open order status page blank. If an extension during checkout (payment step) never loads, open checkout UI extension not loading. If logo / colors / Branding API tokens never apply on live checkout, open checkout branding API not applying.

Align the thank-you / order status Checkout Extensibility surfaces: reinstall or re-authorize scopes; place UI extensions on the thank-you / order-status targets Shopify documents (not a checkout UI block during payment); migrate legacy additional scripts into supported thank-you extensibility or app pixels / customer events where Shopify allows; publish the checkout profile after edits; confirm Customer Privacy / consent does not block the script for the test Market. Do not paste Online Store theme JS into thank-you and expect Checkout Extensibility to honor it.

Complete a new logged-out checkout (private window). If you just upgraded off checkout.liquid, also walk checkout-extensibility-upgrade-broken. Related third-party thank-you upsell apps: thank-you page upsell broken. Related blank thank-you / order status after extensibility: order status page blank.

Checklist: (1) screenshot Admin thank-you / order status customization vs buyer thank-you with the script/UI missing, (2) confirm Checkout Extensibility (not checkout.liquid additional scripts alone), (3) confirm published profile includes the thank-you / order-status extension or app, (4) confirm extension target is thank-you / order-status — not checkout UI during payment and not post-purchase, (5) confirm consent / Customer Privacy allows the script for the test Market, (6) republish profile, (7) retest a new paid order, (8) if only post-purchase, order status blank, checkout UI extension, or Branding API remain, switch playbooks.

Prove it: new paid order → thank-you shows the expected additional script / UI block; draft profile changes do not leak until published; post-purchase and Branding stay independent. If the whole thank-you / order status page is blank after a successful payment, open order status page blank.

Post-purchase one-click upsell page not loading is post-purchase page not loading. Order status / thank-you page blank is order status page blank. Checkout UI extension / app block not loading during checkout is checkout UI extension not loading. Checkout Branding API / editor branding not applying is checkout branding API not applying. Third-party thank-you upsell apps broken is thank-you page upsell broken. Extensibility upgrade broken after checkout.liquid is checkout-extensibility-upgrade-broken. None of those finish a thank-you customization bug where Checkout Extensibility thank-you additional scripts or UI never appear on the thank-you surface after payment.

Finish prove Plus / published thank-you profile → fix app + thank-you targets → new-paid-order proof first. Only then open the related playbook that matches the remaining symptom.

Stay DIY if you can spend one afternoon on the list above: prove thank-you customization on a live paid order, fix Checkout Extensibility / published thank-you profile, clear app install and thank-you targets, and stop treating post-purchase / order status blank / checkout UI extension / Branding API as the same bug. That is the whole playbook. No agency required. Short answers also live on the merchant FAQ. Related pages: post-purchase page not loading, order status page blank, checkout UI extension not loading, checkout branding API not applying, thank-you page upsell broken, checkout extensibility upgrade broken.

Pay for help when the work is not the thank-you toggle — it is connecting the stack you already have so lead capture is not dying in DMs, cart / ops exceptions land in a channel you already check, and the live store is one workflow instead of a spreadsheet plus a Slack bot you forgot. That is the Latch AI Ops install.

What $997 USD one-time buys: lead capture on the live store, ops alerts in a channel you already check, and a checkout-ready workflow. 72 hours after collaborator access, not after payment. One live Shopify store. Access plus a delivery thread. Store URL collected at checkout. Not a SaaS seat, not an upsell retainer, not a conversion guarantee, not a brand or theme job.

Other shops’ public ranges, not testimonials: a checkout / ops install typically runs $500–$2,500. A full ops consulting block typically runs $2,000–$5,000. $997 is the cheap end of that work, sold as a 72-hour install of three systems — not as an earnings number or uptime claim.

What it does not buy: more orders, automatic Plus eligibility, a thank-you funnel rewrite, or a case study. Latch AI Ops has not published customer proof because there are no customers yet. You are buying the install.

Checkout is on Whop. Operator is Nico. United States offer. You can revoke collaborator access after handoff. We do not take owner passwords.