Browse categories
Explore
Fiverr Pro
English
$
USD
I will upgrade shopify plus checkout with checkout extensibility and functions
Faith W
About this gig
Need a Shopify Plus checkout that is modern, extensible, and ready for your next stage of growth? I build and upgrade Shopify checkout experiences using Checkout Extensibility, Checkout UI Extensions, Shopify Functions, and Shopify's current app architecture.
I can help with:
- Checkout Extensibility migration
- Shopify Plus checkout customization
- Checkout UI Extensions
- Shopify Functions
- Discount customization
- Cart and checkout validation
- Shipping customization
- Payment customization
- Custom checkout blocks
- Checkout branding
- Upsell and merchandising workflows
- Legacy checkout customization migration
- Shopify CLI development
- Checkout integration testing
- Production deployment and QA
I will audit your existing checkout, map your current customizations and apps, design the appropriate extension architecture, develop the required functionality, test critical checkout flows, and deploy the approved solution. This service is designed for Shopify Plus merchants replacing legacy checkout customizations or building sophisticated checkout workflows.
I will review the requirements, define the scope, recommend the appropriate package.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Faith W
Faith W
Shopify Technical Specialist Web Pixels Checkout Extensibility Expert
- FromUnited States
- Member sinceSep 2026
Languages
English, Spanish, French
I'm a specialized Shopify technical developer focused on backend infrastructure migrations, custom data layers, and checkout optimization. With Shopify permanently deprecating legacy checkout scripts and cutting off ScriptTag mutations, I help mid-market e-commerce brands safely modernize their tech stacks without losing conversion data or breaking their backend business logic.
My core expertise includes:
If your ad platform tracking has gone quiet or your custom checkout rules are failing, I am here to build a compliant, high-performing solution. Let's get your store fully optimized!
Other Website Maintenance Services I Offer
FAQ
Do you work with Shopify Plus?
Yes. This gig is primarily designed for Shopify Plus merchants requiring advanced checkout customization and extensibility.
What is Shopify Checkout Extensibility?
It is Shopify's current framework for extending checkout through supported extension technologies instead of relying on legacy checkout customization methods.
Can you migrate my checkout.liquid customization?
Yes. I'll audit the existing customization and determine which parts should become Checkout UI Extensions, Functions, app functionality, or another supported implementation.
Can you build custom Checkout UI Extensions?
Yes. I can build custom checkout UI functionality using Shopify's supported extension architecture and target APIs.
Can you build Shopify Functions?
Yes. Depending on your requirements, I can work with supported Function APIs for checkout-related business logic.
