Shopify stores designed and launched
Done-for-you Checkout Page and Shopify connection
Shopify Checkout Page Customization App, Priced Up Front, Built With Care
A Shopify checkout page customization app setup is about moving to Checkout Extensibility: checkout.liquid is retired, customisations on core steps were switched off in August 2024 and Plus thank-you and order-status pages had until August 28, 2025. The replacements are Checkout UI extensions for the interface and Shopify Functions for discounts and delivery logic. We audit, rebuild and test, from $390.
- Existing customisations audited with Shopify's report
- Checkout UI extensions and Functions built
- Scripts replaced and tested
- Test log and a recorded handover
From$690
Delivery3 to 16 working days
Revisions2 rounds
Our track record
450+ Shopify Stores, 4.9+ From Verified Clients. Your Checkout Page Setup Is Handled by the Same Team.
Verified clients give us an average of 4.9+. Your Checkout Page job gets the same discipline as a full store build: a clear written scope, a safe copy for testing and a log of what was checked.
Average rating from verified clients
Building Shopify stores since
Secure checkout
Pay through a protected checkout and keep a full order record.
Two revision rounds
Included in every package, so the result matches what you pictured.
Backup before changes
We work on a duplicate of your theme, never on your live store.
Who this is for
Six Situations Where Shopify Checkout Page Customization App Pays Off
Checkout code from the old days no longer runs. These are the cases we build for.
You are a good fit if
- Your orders come through Shopify
- Checkout Page is, or will be, in your toolset
- You would rather pay once than by the hour
- You can review a test run with us
Stores with old checkout.liquid code
Customisations are locked and uneditable if not upgraded.
Plus stores with Scripts
Scripts must be replaced with Shopify Functions.
Stores adding upsells or fields
Checkout UI extensions add interface elements.
Stores with discount logic
Functions customise discounts and delivery rules.
Stores starting an audit
Shopify generates a report of existing customisations, also as a CSV.
Non-Plus stores
Logos, fonts and colours can still be changed in the theme editor.
Problems solved
Shopify Checkout Page Customization App: Six Faults We Fix First
Checkout migrations fail on missed customisations. These are the six faults we fix.
The problem
Customisation lost
The outcome
A feature vanishes. We audit first.
The problem
Scripts not replaced
The outcome
Discounts break. We rebuild as Functions.
The problem
Deadline passed
The outcome
Pages are locked. We prioritise.
The problem
Tracking scripts removed
The outcome
Conversions drop. We use pixels and server tracking.
The problem
Dates misread
The outcome
Plans slip. We use Shopify's current docs.
The problem
No handover
The outcome
Extensions are undocumented. We document them.
What we can do
Six Parts of a Reliable Checkout Page and Shopify Connection
How we upgrade Shopify checkout, in order.
Audit
Customisation report.
Plan
Extension or Function.
Build
UI extensions and Functions.
Tracking
Pixels.
Tests
Full checkout.
Handover
Notes and recording.
What is included
Everything Included in Our Shopify Checkout Page Customization App Packages
Here is the full list, grouped by job. Smaller packages cover the first items in each group; larger ones go further.
Connection
- Live read before we build
- Checkout Page authorised with an API key with restricted permissions
- Tokens held in a secure vault
- A scheduled check that the link is alive
Triggers
- Trigger built for when a checkout is completed
- Trigger for the moment a refund is issued
- Sequence of events tested
- Tag, country and value filters
Mapping
- Mapping table in the handover notes
- Extra fields mapped on request
- Currency handled, including blanks
- Who wins each field, in writing
Safety
- You hear about failed runs
- Retries update the record
- Silent failures found by a daily check
- We stay inside rate limits
Testing
- A written log of every test
- Edge cases: refunds and edits
- Test on a failed payment
- Test on a completed checkout
Handover
- Questions answered after launch
- Two structured revision rounds
- Flow diagram included
- Short recorded walkthrough
You share access, answer a short brief and confirm the test results. Everything else, from the first connection to the final log, is ours.
See how the data moves
What Happens When a checkout is completed: The Checkout Page Flow
See the build as a short chain: event, check, write, log. Each link is tested on its own and again as a whole, with real orders, before we ask you to approve anything.
Portfolio
Our Store Work Behind Your Checkout Page Integration
Integrations sit behind the storefront, so here is the storefront we build. Picture each store below with payments flowing into Checkout Page.
Adjustable Kettlebell One-Product Store
Fitness equipment
Dog Travel Accessories Dropshipping Store
Pet travel accessories
Move With Amari Fitness creator Shopify Visual
Fitness creator
Kinetic Components Electronics Shopify Visual
Electronics
Ironform Fitness Shopify Visual
Fitness
Signal City Streetwear Shopify Visual
StreetwearProcess and timeline
From First Call to Live Sync: Our Shopify Checkout Page Customization App Process
A fixed order of work keeps the project predictable. You know what happens next at every point.
- 1
Brief and scope
We start with questions: what you sell, how Checkout Page fits your day and which events matter. Reading through your orders and payments shows where the flow begins and what it must never touch.
- 2
Access and connection
You approve narrow access to Shopify and Checkout Page, using an API key with restricted permissions. We confirm the connection with a live read before building on it.
- 3
Map and rule
We map charge id, order number, fee and currency, then agree which side wins each conflict and what blanks should do, in writing.
- 4
Build in a copy
The flow is built against test data, never your live records. You see the plan and, where useful, a recorded run.
- 5
Test on real cases
Cases tested: a completed checkout, a failed payment and a refund, plus refunds and edits. Every result is compared with Shopify's own figures.
- 6
Go live and hand over
After your approval we turn the flow on, follow the first live runs, then hand over notes, a diagram and a short recorded tour.
Compare your options
Checkout Page Native App, Automation Platform, Freelance Gig or Our Shopify Checkout Page Customization App?
Each route has a place. Read across the rows that matter to you and see which one you would trust with your orders.
| What matters | DIY with Checkout Page | Zapier or Make | Gig marketplace | Store Design Expert |
|---|---|---|---|---|
| Careful field-by-field mapping | Out-of-the-box fields | If you build it | Varies | Yes |
| Duplicates blocked by a unique key | Rarely handled | Possible | Not usually | Yes |
| Failures alert a named person | No | If you add it | Rarely | Yes |
| Tested on refunds and edits | Rarely | If you test | Varies | Yes |
| You see the cost before we begin | Subscription only | Plan fees and your time | Yes | Yes |
| Notes and a recorded walkthrough | No | No | Rarely | Yes |
| Ownership stays with you | Yes | Yes | Varies | Yes |
| Help after go-live | Vendor help desk | Platform help desk | Varies | Included window |
Inside every project
What Keeps Your Store and Checkout Page Data Safe
None of these costs extra. They are simply how we work.
Secrets kept in a vault
A secure vault holds every key and token; none appear in notes or chat.
Build in a copy, never live
Test data comes first. Live orders and payments are left alone until you sign off.
Plain scope, two revision rounds
Price first, then two structured revision rounds for anything in scope, so no tweak becomes a surprise charge.
Nothing sent without approval
No message to a customer goes live until you have read and approved it.
Failures raise a flag
A failed run alerts a named person with the order and the reason. Silence never means success.
A written definition of done
The flow counts as finished only when a completed checkout, a failed payment and a refund all pass and are logged.
Interactive price calculator
Price Your Shopify Checkout Page Customization App
Pick a package, answer three short questions and add any extras. Your total and delivery window update as you click, with nothing hidden until checkout.
Request a custom quote
If your Checkout Page setup uses custom code, a private API, an on-premise system or more than one store, send us a short brief and we will quote it as a fixed-price project.
Request a QuoteChanged your mind? Choose Single Workflow, Core Workflows or Full Integration above to return to the instant calculator.
Packages and comparison
Checkout Page Integration Package Comparison
Here is each package line by line. When you compare our fee with a marketplace listing for Shopify Checkout Page customization app, count how many of these checks the cheaper offer actually names.
| What is included | Single Workflow $690 | Core Workflows $1,390Recommended | Full Integration $2,690 |
|---|---|---|---|
| Checkout Page linked with an API key with restricted permissions | Included | Included | Included |
| Trigger for the event: a checkout is completed | Included | Included | Included |
| Mapping for charge id, order number and fee | Included | Included | Included |
| A unique key on every write | Included | Included | Included |
| Written test log and video handover | Included | Included | Included |
| A trigger for each: a checkout is completed, a payment fails, a refund is issued | Not included | Included | Included |
| Currency and custom fields mapped | Not included | Included | Included |
| Tag, country and value filters | Not included | Included | Included |
| Failed runs retried, then reported | Not included | Included | Included |
| Both-way sync with a winner for each field | Not included | Not included | Included |
| One-off history load of past payments | Not included | Not included | Included |
| A fortnight of run checks after launch | Not included | Not included | Included |
| A runbook your team can follow | Not included | Not included | Included |
| Typical delivery | 3 to 6 days | 6 to 10 days | 9 to 16 days |
The calculator above is the source of truth for your final price and delivery estimate.
Why Store Design Expert
What You Get From Us That a Template Does Not
Most of this job is clicking, and you could do it. People hire us because the unglamorous parts, ids, timing and edge cases, decide whether the connection helps or hurts.
A price you can plan around
You see the cost and extra days for each choice in the calculator. Any Checkout Page subscription is billed by Checkout Page, so check what it charges today.
A direct line to the builder
Your messages reach the builder who has your flow open, so trigger and field questions get clear answers.
We live inside Shopify
Daily work on orders, refunds and metafields gives us Shopify depth that Checkout Page menus alone do not.
4.9+ from verified clients
You can read verified client reviews on this page before paying, so past results are visible.
Notes a colleague can follow
The handover notes say what moves where and why each setting was chosen, so nobody has to guess later.
Safety designed in
Every build includes retries, alerts, unique keys and narrow access; none are paid extras.
What we need to get started
What We Need From You to Begin
The list is short. Most owners have everything ready in a day.
Approve a collaborator request
Selling already? Send the address and accept a collaborator request. You keep ownership, we get a limited role, and you can revoke it at any moment.
Starting from nothing? We build first
Without a store, we build one in a Partner account with Checkout Page connected, then transfer it to you. You pick a plan once everything works.
Or share a staff login
A staff login works if that is easier. We still recommend the collaborator route, since it can be revoked in one click and leaves no password in circulation.
Your Checkout Page access
Set up the account and invite us, or have us create it under your email. You stay the owner either way, and access runs through an API key with restricted permissions.
Sample records
Send two or three typical records from each side, or tell us where to find them. Real examples show us how your data is actually shaped.
A decision-maker
Name the person who approves the plan and the test, and tell us which system should win when Checkout Page and Shopify disagree.
We never need your owner password or payment details. Access is limited, logged and removable at any time.
Testimonials
What Store Owners Say After Working With Us
Verified clients describe the brief, the build and the handover in their own words.
Verified
Store Design Expert was very knowledgeable about what I needed done to fix my Shopify store and how to improve the store layout. The project was completed very quickly, and I will definitely use them for support as my business grows.
ST
Samuel T.United States
Verified
Very satisfied with the work. Most importantly, Store Design Expert responded promptly to my questions and concerns. Thank you!
KB
Kyle B.United States
Verified
Outstanding work and outstanding customer service. Five stars! I will absolutely use Store Design Expert again for my next book.
KM
Katharine M.United States
Verified
Store Design Expert was great! They delivered exactly what I asked for and even offered helpful extra suggestions. Highly recommended.
PW
Paul W.United States
Verified
I request Store Design Expert every time I have a project. They are professional and give real attention to detail, which makes the work stand out.
LK
Laura K.United States
Verified
They kept communicating until the problem was fully resolved, and the result was great.
HJ
Henry J.United States
Verified
Super helpful and patient. I am new to ecommerce and Store Design Expert talked me through the whole process and even fixed my payment bridging for me!
LR
Lois R.United Kingdom
Verified
I am beyond satisfied! Store Design Expert went above and beyond on my project. Highly recommended!
MD
Michael D.United States
Verified
The experience was tailored to my brand and specifications to the letter. I love the result.
EP
Eric P.United States
FAQ
Shopify Checkout Page Customization App FAQs
Everything owners ask us before booking.
How much does Shopify Checkout Page customization app cost?
Single Workflow costs $690, Core Workflows $1390 and Full Integration $2690. Order volume, data direction, existing Checkout Page data and add-ons change the total, and the calculator shows it before you pay. Most projects land between about $690 and $3770, with delivery from 3 to 16 working days.
How long does the Checkout Page integration take?
Single Workflow takes 3 to 6 working days, Core Workflows 6 to 10 and Full Integration 9 to 16. The usual variables are how much history you want loaded and how quickly you approve the test results. The Sooner and Fastest options shorten the schedule when a launch date is fixed.
Is checkout.liquid still supported?
No, Shopify is discontinuing it and locks unmigrated customisations.
What replaces it?
Checkout UI extensions and Shopify Functions. Searches like "checkout ui extensions shopify functions" point to this service.
What about Scripts?
They must be replaced with Shopify Functions. People also search for "shopify plus checkout page"; the work is the same.
When was the deadline?
Dates vary by source; Plus thank-you pages had until August 28, 2025. The same job is behind "edit checkout page shopify".
How do I see what I have?
Shopify generates a customisation report in admin. The same job is behind "customize checkout page shopify".
Can non-Plus stores customise?
Only visually in the theme editor. Queries such as "how to change checkout page in shopify" lead to the same build.
Can you upgrade my checkout?
Yes. Queries such as "shopify to checkout page sync" point to this service.
Ready when you are
Ready for a Checkout Page Integration That Just Works?
If the steps above sound right, pick a package and answer three questions. Work begins once you pay. This page covers Shopify Checkout Page customization app.
- Secure checkout
- Two revision rounds
- Test log and walkthrough included