S2S tracking is the most reliable method available. When a conversion happens, your server sends a postback directly to the tracking platform with the click ID and conversion details. No browser involvement means no cookie restrictions, no ad blockers, and no cross-device attribution issues.
2. Your site stores the click ID (in session, database, or URL parameter)
3. User converts (signup, deposit, purchase)
4. Your server fires a postback URL to the tracking platform with the click ID
5. The platform matches the conversion to the original click and calculates commission
UTM Parameters and Custom Parameters
UTM parameters (utm_source, utm_medium, utm_campaign) help you identify traffic sources in analytics tools. Custom parameters (sub_id, click_id, partner_id) carry affiliate-specific data through the conversion flow. Always pass both -- UTMs for analytics, custom parameters for commission calculation.
Coupon Code Tracking
Not all conversions start with a click. Influencer marketing, podcast sponsorships, and offline referrals often use coupon codes instead. The user enters a code at checkout, and the system matches it to the affiliate who owns that code. This is especially common in prop trading and e-commerce verticals.
Smart Links
Smart links are dynamic URLs that route users based on device, location, or other criteria while maintaining tracking parameters. A single link can send mobile users to an app store and desktop users to a website, with the same affiliate getting credit for both paths.
For maximum tracking reliability, implement S2S postbacks as your primary method and use coupon codes as a supplementary method for influencer and offline channels. This covers both click-based and non-click-based conversions.
Key Takeaways
S2S postback tracking is the most reliable method -- no browser dependency
Always pass both UTM parameters (for analytics) and custom parameters (for commissions)
Coupon code tracking covers non-click conversions from influencers and offline channels
Smart links handle multi-device attribution with a single URL per affiliate