Influencer Tracking

Overview

Influencer marketing drives significant revenue but is notoriously difficult to attribute because customers often see a post, leave the platform, and purchase days later through a direct or organic channel. The solution is using both UTM links (for web traffic) and unique discount codes (for purchase attribution) together — these two signals complement each other and provide reliable attribution across devices. Most of this setup requires no custom code.

Note: For full influencer campaign management (discovery, briefs, deliverables), see @influencer-marketplace-integration. This skill focuses purely on attribution and analytics.

When to Use This Skill

• When managing 10+ influencer partnerships and tracking them in a spreadsheet
• When needing to prove ROI of influencer spend to leadership with first-party data
• When running gifting campaigns and needing to separate organic versus paid post attribution
• When comparing performance across platforms (Instagram, TikTok, YouTube) in a single dashboard

Core Instructions

Step 1: Set up UTM links for each creator

Create a unique UTM link for every influencer and campaign combination. Use Google's Campaign URL Builder at ga-dev-tools.google.com/campaign-url-builder:

UTM Parameter	Value	Example
utm_source	Social platform	instagram, tiktok, youtube
utm_medium	Always influencer	influencer
utm_campaign	Campaign name	spring-2026, black-friday
utm_content	Creator handle	janedoe, johndoe_fitness

Example URL: yourstore.com/?utm_source=instagram&utm_medium=influencer&utm_campaign=spring-2026&utm_content=janedoe

Shorten the link for Instagram bio use: use Bitly or a custom short domain. Store the mapping between short URL and UTM parameters in a spreadsheet.

Important: give influencers the shortened link and instruct them to place it in their link-in-bio, not in the post caption (Instagram captions do not have clickable links).

Step 2: Create unique discount codes for each creator

Discount codes capture purchases that happen via direct/organic after the initial influencer visit — the UTM link alone misses these.

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Shopify

1. Go to Shopify Admin → Discounts → Create Discount → Amount off order
2. Configure:
   • Discount code: JANEDOE15 (creator handle + percentage)
   • Discount type: Percentage — 15%
   • Applies to: All products (or specific collections if needed)
   • Minimum purchase requirement: $30 (to ensure positive ROI)
   • Usage limits: Enable "Limit to one use per customer"
   • Active dates: Set campaign start and end date
3. Click Save and send the code to the influencer

Pro tip: Use Shopify Flow (Plus) or an app like Glew to automatically tag orders using a specific discount code with the influencer's name — this makes attribution reporting easier.

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WooCommerce

1. Go to WooCommerce → Marketing → Coupons → Add coupon
2. Configure:
   • Coupon code: JANEDOE15
   • Discount type: Percentage discount — 15%
   • Minimum spend: $30
   • Usage limit per user: 1
   • Coupon expiry date: Campaign end date
3. Under Restrictions → Allowed emails: optionally limit to new customers only

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BigCommerce

1. Go to BigCommerce Admin → Marketing → Promotions → Create Promotion
2. Set coupon code, discount amount, and usage limits
3. Set an expiry date matching the campaign end date

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Step 3: Track attribution in Google Analytics 4

For all platforms, UTM tracking works through GA4 automatically:

1. In GA4 → Reports → Acquisition → Traffic Acquisition: filter by Session medium = influencer to see all influencer-driven sessions
2. In GA4 → Reports → Acquisition → Traffic Acquisition: add Session campaign as a secondary dimension to compare by campaign
3. In GA4 → Explore → Free Form: build a report with utm_content as a dimension to compare creator performance

See influencer-attributed revenue:

1. Go to GA4 → Reports → Monetization → Ecommerce Purchases
2. Filter by utm_medium = influencer
3. Add utm_content as a dimension to see revenue per creator

Step 4: Track discount code revenue

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Shopify

1. Go to Shopify Admin → Analytics → Reports → Discounts → Discount codes
2. Filter by creator-specific codes to see revenue, order count, and usage per influencer
3. For a comparison view: Analytics → Custom Reports → Orders → group by discount code

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WooCommerce

1. Go to WooCommerce → Analytics → Coupons
2. Filter by influencer-specific coupon codes to see revenue and orders
3. Or install Metorik ($50/mo) for more advanced coupon attribution reporting

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Step 5: Build a creator performance tracker

Combine UTM revenue (from GA4) and discount code revenue (from Shopify/WooCommerce) in a single tracking spreadsheet:

Creator	Platform	Campaign	UTM Revenue	Code Revenue	Total Revenue	Cost	ROAS
@janedoe	Instagram	Spring 2026	$840	$1,200	$2,040	$500	4.1x
@johndoe	TikTok	Spring 2026	$320	$680	$1,000	$300	3.3x

ROAS calculation: Total Revenue ÷ Campaign Cost (flat fee + COGS of gifted product + commission paid)

Normalize by reach for fair comparison between micro and macro influencers:

• Revenue per 1,000 followers = Total Revenue / (Follower Count / 1,000)
• This metric often reveals that micro-influencers outperform macro-influencers significantly

Step 6: For headless stores — capture first-touch attribution

Standard last-click UTM attribution in GA4 misses influencer impact. Capture first-touch UTM data server-side:

// On page load, store the first UTM touch in a session cookie
function captureFirstTouchUTM() {
  const params = new URLSearchParams(window.location.search);
  if (!params.get('utm_source')) return;

  // Only store if no first-touch already captured this session
  if (!sessionStorage.getItem('first_touch_utm')) {
    sessionStorage.setItem('first_touch_utm', JSON.stringify({
      utm_source: params.get('utm_source'),
      utm_medium: params.get('utm_medium'),
      utm_campaign: params.get('utm_campaign'),
      utm_content: params.get('utm_content'),
      landed_at: new Date().toISOString(),
    }));
  }
}

// At checkout, include first-touch UTM in the order metadata
// Store in your order database for reporting

Best Practices

• Always use both UTM links and promo codes — UTM tracks web traffic; codes capture purchases that happen days later via direct or organic
• Use utm_content for the influencer handle — this lets you compare performance by creator within a single campaign (e.g., 20 influencers in the same spring campaign)
• For Instagram, links must go in bio — give influencers a link-in-bio URL and tell them to reference "link in bio" in their caption; caption links are not clickable
• Set campaign end dates on promo codes — expires influencer discounts automatically and prevents long-term code sharing on coupon sites
• Track gifting value as campaign cost — gifted products have COGS; include this in your ROAS calculation
• Compare EMV (Earned Media Value) alongside revenue — high-reach posts with lower conversion may still justify spend as brand awareness

Common Pitfalls

Problem	Solution
Promo codes shared on coupon/deal sites	Add per-customer usage limit (1 per customer) and monitor daily usage velocity for spikes
UTM attribution lost when customer uses a different device	Supplement UTM tracking with promo codes as a device-agnostic signal
No way to compare micro-influencers vs. macro-influencers fairly	Calculate revenue per 1,000 followers (normalized RPM) to compare across follower counts
Influencer posts after campaign end date	Add a 7-day grace period to your code expiry; store first_attributed_order_at to detect late posts
GA4 shows organic instead of influencer for returning customers	Use first-touch attribution model in GA4 Explore or compare against discount code data

Related Skills

• @influencer-marketplace-integration
• @affiliate-program
• @marketing-attribution-dashboard
• @social-commerce
• @ugc-campaign-management