SourceSmart Discounts: UTM & Lead Source-Based Offers
The Opportunity
A merchant-facing discount engine that captures lead_source and UTM data via checkout UI extensions and applies targeted discounts using Shopify Functions. It removes custom coding by shipping a prebuilt Function that reads cart metafields reliably and a UI for building rules.
"Merchants want to target discounts by acquisition source (lead_source, UTM) but face brittle custom extensions and Function read issues during the attributes→metafields migration."
Market Validation
Detailed Analysis
Proposed Solution
Provide a turnkey app that defines and manages required CART metafields, ensures storefront visibility, captures source data, and runs a configurable Discount Function with rules for UTM parameters, referrers, and campaigns; includes analytics and order-level propagation.
Target Audience
DTC brands, performance marketers, and Plus merchants running paid campaigns and affiliate programs
Competitive Landscape
Discount Ninja, Flycart Automatic Discounts, Ultimate Special Offers, Seguno; few provide robust UTM/lead-source-based Function rules
Implementation Notes
Bundle a Checkout UI extension that captures UTM/referrer/affiliation and writes to CART metafields; auto-create metafield definitions with storefront visibility and cart_to_order_copyable; ship a configurable Discount Function that reads cart.metafield(namespace,key) for lead source, supports priority stacking and exclusions, and returns deterministic discounts; add a rules UI (campaign equals, contains, regex, channel mapping); implement analytics for conversion lift by source and variant testing; provide graceful fallbacks if metafields are absent.
Evidence from Merchants
Real quotes from Shopify community forums
"We are hitting a wall trying to read those same metafields inside our Discount Function."
"The metafields return null or an empty array, even though we have verified they exist on the backend."
"Is there a specific Metafield Visibility or Access Setting required for the Function API to 'see' cart-level metafields?"
Key Pain Points
Inability to read metafields in Discount Function after migrating from attributes.
criticalMentioned by 1 merchants
Impact: Potential revenue loss due to inability to apply discounts correctly.
Market Metrics
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