Shopify Developer: Multi-Partner Referral Discount System
2 days ago
Job description
We are looking for an experienced Shopify developer to implement a scalable partner referral discount system inside our Shopify store.
The goal is:
- Each partner gets one unique referral link
- Customers coming through that link can apply a discount code (as an example 3%)
- The discount code must only work if the customer actually came through a valid partner link
- If the code is leaked and used without a referral link → discount must be 0%
Core Requirements:
Partner Referral Links
Each partner receives a unique link, for example:
-
The system must support multiple partners dynamically, not a hardcoded single value.
Expected Customer Flow:
Customer lands on the homepage with a URL parameter (e.g. promo=partnerA)
- The partner identifier must be stored as a Cart Attribute
- At checkout, a Shopify Discount Function validates that a promo attribute exists
- If valid → apply 3% discount
- If missing → apply 0% discount
Scope of Work:
Theme Integration:
Capture Partner Parameter Globally
A theme-level implementation must ensure:
- URL parameter promo is detected on entry
- Its value is saved into Shopify Cart Attributes
- The value persists during the shopping session
- The logic must work for any partner value, not a single fixed one
Shopify App + Discount Function Extension
A custom internal Shopify app must be created including a Discount Function Extension.
This function will determine whether the discount is applied in checkout.
- Build a
Discount Function:
- Shopify Functions Discount API Reference:
The Discount Function must:
- Read the cart attribute promo
- Confirm that a promo value exists
- Apply a 3% order discount if the attribute is present and nonempty
- Return no discount if the attribute is missing
Discount Function input structure:
Discount Code Creation Linked to the Function
We want one public discount code (example: WELCOME10) that is controlled entirely by the function.
The discount code must:
- Work only when validated by the Discount Function
- Provide no discount if used without a promo referral session
- This requires an Appmanaged discount code.
Create App Discount Code (discountCodeAppCreate):
Retrieve Function IDs (appDiscountTypes query):
Testing Requirements
Developer must verify:
Test 1 — Code Leak Scenario
- Open store in incognito
- Add product to cart
- Apply discount code without visiting a referral link
Expected result:
No discount applied
Test 2 — Partner Referral Scenario
- Visit store with a referral parameter (e.g. ?promo=partnerA)
- Add product to cart
- Apply discount code
- Expected result: 3% discount applied
- Repeat Test 2 with at least 2–3 different partner identifiers
- Expected result:
Contract duration of less than 1 month. with 0 hours per week.
Mandatory skills:
Shopify, Shopify Functions, Shopify CLI & App Extensions, Cart Attributes & Ajax Cart API, Shopify App Development
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