Shopify Functions
Shopify Functions for cart and checkout logic that belongs server-side
Some rules should not rely on theme JavaScript alone. Shopify Functions run close to checkout for discount, cart and delivery logic on supported plans. NP SoftTech develops Functions when your requirements fit the platform capabilities.
Who it is forD2C brands and agencies that need clear Shopify development help.
How we workUnderstand the store, scope the work, build carefully, then support what launches.
What you getPractical delivery, documented decisions and a path for ongoing improvements.
Who this is for
- Merchants with complex discount rules beyond native Shopify discounts
- Brands needing cart validation before checkout completes
- Stores on plans that support Shopify Functions
- Teams replacing fragile checkout scripts with supported Function logic
Common problems
- Discount apps conflict with each other or slow checkout
- Cart rules enforced in JavaScript can be bypassed or break on mobile
- Delivery or payment customisation needs plan-appropriate tooling
- Marketing wants promotions that standard discount codes cannot express
- Previous custom checkout scripts broke after Shopify updates
What NP SoftTech does
- Review requirements against Shopify Function types available on your plan
- Develop discount, cart, delivery or payment Functions as applicable
- Test edge cases: stacked discounts, international carts, B2B rules
- Deploy through Shopify app or extension workflow
- Document rules in plain language for your merchandising team
- Maintain Functions when Shopify API versions change
Process
- Rule workshop: inputs, outputs and exceptions
- Confirm plan support and Function type fit
- Prototype on development store
- Test with representative carts and customer segments
- Production release with monitoring
- Handover documentation
Deliverables
- Deployed Shopify Function code
- Test cases covered
- Merchant-facing explanation of rules
- Upgrade notes when Shopify deprecates API versions
Technical capabilities involved
Explained in business terms. We use these tools where they solve a real store need.
- Shopify Functions API
- Discount, cart, delivery and payment Function targets
- Shopify CLI and app deployment pipeline
- Rust or JavaScript Function runtimes as required by Shopify
FAQs
Do Functions work on all Shopify plans?
No. Availability depends on your Shopify plan and the Function type needed. We confirm during scoping before quoting.
Functions or theme JavaScript?
Use Functions when rules must be enforced reliably at cart or checkout. Use theme code for display and UX. We often combine both.
Can Functions replace my discount app?
Sometimes, if your rules fit Function limits. Complex promotion suites may still need apps or a hybrid approach.
Describe your Shopify Functions requirement
Explain the cart, discount or checkout rule you need and your Shopify plan if known.