Tracking in-app purchase conversions from affiliate links requires three components working together: a lightweight SDK embedded in your app, server-side webhook callbacks that fire when purchases occur, and a dashboard that ties each transaction back to the affiliate who referred it. Without all three, you either lose attribution data between the link click and the purchase, or you pay commissions you cannot verify. This guide walks through how to set it up correctly.
Why Is In-App Purchase Tracking Different from Web Tracking?
Web-based affiliate tracking relies on cookies and redirect chains. A user clicks a link, lands on a page, and the browser holds a cookie that credits the affiliate when a purchase happens. Mobile apps break that model entirely. The purchase happens inside the app through Apple's App Store or Google Play billing systems, not through a web checkout. The affiliate link click and the actual transaction occur in two different environments.
This gap is why standard affiliate platforms struggle with mobile. According to wecantrack, over 60% of affiliate clicks now come from mobile devices, yet desktop clicks convert at two to three times the rate of mobile. Much of that disparity comes from broken attribution rather than lower buyer intent. The in-app purchase conversion rate across mobile apps sits between 1% and 2% on average, according to Business of Apps, but apps with proper tracking and optimized funnels routinely exceed those benchmarks.
How Does the Tracking Flow Actually Work?
The end-to-end flow has four stages:
- An affiliate shares a tracking link (typically a Universal Link on iOS or an App Link on Android).
- The user clicks the link and either opens the app directly or installs it first. The SDK captures the referral parameters from the link and stores them locally.
- The user makes an in-app purchase or starts a subscription. The app's purchase management layer (RevenueCat, Adapty, or Iaptic) processes the transaction.
- A server-side webhook fires from the purchase management platform to your affiliate tracking system, carrying the transaction details. The tracking system matches the purchase to the stored referral data and attributes the conversion to the correct affiliate.
The critical point is stage two. If the SDK does not persist the affiliate referral data through the install process, the attribution is lost. Deep linking frameworks solve this by passing parameters through the app install, so the referral survives even if the user had to visit the App Store or Play Store before opening the app.
What SDK Integration Looks Like
Insert Affiliate provides native SDKs for Swift, Kotlin, React Native, Flutter, and Unity. The integration is straightforward. You initialize the SDK with your company identifier, and it automatically handles deep link capture and referral persistence.
For a React Native app, the setup involves importing the SDK, initializing it in your app's entry point, and configuring your deep link scheme. The SDK listens for incoming affiliate links, extracts the tracking parameters, and stores them securely on the device. When the user later makes a purchase, the SDK associates that transaction with the referring affiliate.
The SDK is lightweight by design. It does not interfere with your purchase flow or modify your app's billing logic. It simply observes and attributes.
Setting Up Webhook Callbacks for Purchase Events
Webhooks are the backbone of server-side conversion tracking. When a user completes a purchase, your in-app purchase management platform sends a webhook event to your affiliate tracking endpoint.
Insert Affiliate integrates directly with RevenueCat, Adapty, and Iaptic as purchase management partners. Each of these platforms handles the complexity of subscription lifecycle events: initial purchases, renewals, cancellations, refunds, and billing retries. When any of these events occur, the platform sends a webhook payload to Insert Affiliate's API.
The webhook carries the transaction amount, product identifier, currency, and a user identifier that Insert Affiliate matches against its stored referral data. This server-to-server communication means the attribution does not depend on the user having the app open or being online. The webhook fires regardless.
For RevenueCat specifically, you configure the webhook URL in your RevenueCat dashboard and select which events to forward. Insert Affiliate processes these events automatically and updates commission calculations in real time.
Using the Dashboard to Monitor Conversions
Once the SDK and webhooks are configured, the Insert Affiliate dashboard becomes your single source of truth for affiliate-driven revenue. The dashboard displays each affiliate's click count, conversion count, and attributed revenue. You can see which affiliates are generating actual purchases versus just clicks.
The dashboard supports flexible, tiered commission structures. You can set different commission percentages based on revenue thresholds, product types, or individual affiliate agreements. Commissions are calculated automatically from verified webhook data, so there is no manual reconciliation.
Affiliates also get their own view. They can log in, see their performance metrics, and track their earnings. This transparency reduces disputes and keeps affiliates motivated.
One feature worth noting: Insert Affiliate tracks both mobile in-app purchases and web-based payments from a single dashboard. If your app also supports Stripe payments or RevenueCat Web Billing, those transactions are attributed alongside in-app purchases. This unified view prevents the common problem of running separate tracking systems for web and mobile.
What Metrics Should You Track?
Focus on these five metrics to evaluate your affiliate program's performance:
- Click-to-install rate: the percentage of affiliate link clicks that result in an app install.
- Install-to-purchase rate: the percentage of installs that convert to a paid transaction. The industry average is 1-2%, but well-optimized apps with strong onboarding reach 5% or higher.
- Revenue per affiliate: total attributed revenue divided by the number of active affiliates.
- Time to conversion: the delay between the initial click and the purchase. Mobile users often convert days after the initial click, so a 7 to 30 day attribution window is standard.
- Refund rate by affiliate: a high refund rate from a specific affiliate may indicate low-quality traffic.
Common Setup Mistakes to Avoid
Three errors account for most broken affiliate tracking implementations:
First, not testing deep links through a full install flow. Many developers test deep links only when the app is already installed. The critical path is when a new user clicks an affiliate link, gets redirected to the App Store, installs the app, and opens it for the first time. If referral parameters are not preserved through that sequence, attribution fails silently.
Second, sending the wrong webhook events. Purchase management platforms like RevenueCat can send dozens of event types. Forwarding every event, including test events and internal transactions, creates noise. Configure your webhook to send only production purchase and subscription events.
Third, not accounting for subscription renewals. If your app uses subscriptions, the initial purchase is only the first conversion. Renewals represent ongoing revenue that should also be attributed to the referring affiliate. Make sure your webhook configuration includes renewal events and that your commission structure accounts for recurring revenue.
Getting Started
The setup process takes most teams a few hours. Install the Insert Affiliate SDK in your app, connect your purchase management platform (RevenueCat, Adapty, or Iaptic) via webhooks, and configure your commission structure in the dashboard. Once live, every affiliate-driven purchase is automatically tracked, attributed, and reported.
The global affiliate marketing industry is projected to exceed $20 billion in 2026, with in-app affiliate marketing accounting for roughly 20% of total affiliate spend. Mobile apps that implement proper conversion tracking are positioned to capture a meaningful share of that spend by giving affiliates the transparent, reliable attribution data they need to promote with confidence.