Shopify Plus Checkout Customization (Functions & Extensions)
About Shopify Plus Checkout Customization (Functions & Extensions)
On Shopify Plus you can go well beyond the standard checkout: custom discount logic, shipping and payment rules, branded steps and extra fields. Older stores also need to replace Shopify Scripts with the newer Functions approach. This project plans, builds and tests those customizations so your checkout does what your business needs without breaking conversion.
Who needs this
Shopify Plus merchants with custom checkout needs, and stores still relying on Scripts that must move to Functions.
What's included
- Review of your current checkout, Scripts and customizations
- Written plan of what to rebuild with Functions or extensions
- Custom discount, shipping or payment rules built with Shopify Functions
- Checkout branding and layout adjustments within Shopify's supported options
- Checkout extensions for extra information or messages where needed
- Replacements for Scripts you want to keep
- Testing on real and test orders, including edge cases
- Rollback plan so a problem can be reverted quickly
- Handover notes documenting what each customization does
Plan and plan availability
Checkout customization options depend on your Shopify plan, and Shopify has been retiring Scripts in favor of Functions. We confirm what applies to your store before building anything.
Test with real scenarios
Checkout is where money changes hands. We test combinations like multiple discounts, different countries, gift cards and subscriptions before anything goes live.
What this doesn't promise
Compatibility with features Shopify doesn't support. We tell you early if something isn't possible and suggest the closest supported option.
Related services
The base checkout setup comes first, see payments, shipping and tax setup. Plus unlocks wholesale features, see B2B and wholesale setup, and special rules for recurring orders, see subscriptions and recurring billing. For blocks beyond Functions, custom section and feature development can help.
Delivery: 5–10 business days · Format: Checkout customizations built and tested + handover notes
Shopify Plus Checkout Customization (Functions & Extensions) FAQ
For deep checkout customization, generally yes. We check your plan first and tell you what's possible.
Functions run on Shopify's infrastructure and are designed to be fast. We still test performance.
Yes, we plan which ones to replace with Functions, and rebuild and test them.
We include a rollback plan and test thoroughly first. Ongoing support can be scoped separately.
Shopify Plus Checkout Customization (Functions & Extensions) reviews
A focused entry point to launch with confidence.
- Review of your current checkout, Scripts and customizations
- Written plan of what to rebuild with Functions or extensions
- Custom discount, shipping or payment rules built with Shopify Functions
- Fixed price
- Human-reviewed
- You own it all
The complete scope described on this page.
- Review of your current checkout, Scripts and customizations
- Written plan of what to rebuild with Functions or extensions
- Custom discount, shipping or payment rules built with Shopify Functions
- Checkout branding and layout adjustments within Shopify's supported options
- Checkout extensions for extra information or messages where needed
- Replacements for Scripts you want to keep
- Testing on real and test orders, including edge cases
- Rollback plan so a problem can be reverted quickly
- Handover notes documenting what each customization does
- Fixed price
- Human-reviewed
- You own it all
Dedicated scope, priority delivery, ongoing strategy.
- Review of your current checkout, Scripts and customizations
- Written plan of what to rebuild with Functions or extensions
- Custom discount, shipping or payment rules built with Shopify Functions
- Checkout branding and layout adjustments within Shopify's supported options
- Checkout extensions for extra information or messages where needed
- Replacements for Scripts you want to keep
- Testing on real and test orders, including edge cases
- Rollback plan so a problem can be reverted quickly
- Handover notes documenting what each customization does
- Dedicated account manager
- Priority Slack support
- Quarterly strategy review
- Fixed price
- Human-reviewed
- You own it all
Tell us your scope, timeline and budget — we'll put together a tailored package and send you a written quote.
