Free Trials, Freemium, and Lead Magnets: Who Gets the Commission When the Sale Comes Later?
When the referred visitor signs up free today and pays in November, attribution gets philosophical. Commission models for free-to-paid funnels — per-lead, per-conversion, hybrid — and the windows that make them fair.
In a plain store, attribution is a straight line: click, buy, commission. Add a free layer — a trial, a freemium tier, a lead-magnet email course — and the line bends around a gap of weeks or months. The partner's click produced a signup today; the money arrives in November, if ever. Somewhere in that gap, cookies expire, devices change, and a very fair question forms: whose sale is that?
Programs that never answer it end up answering it partner by partner, in support threads, retroactively. Here are the three coherent answers.
Model 1: pay on the conversion, attribute from the signup
The commission triggers when the referred user pays — but attribution is anchored to the signup, not to a cookie that must survive until the credit card appears. The partner's link tags the account at registration; whenever that account upgrades within your attribution window, the commission fires.
This is the structurally honest model for SaaS and freemium: it pays for the outcome you actually value, and it survives the time gap because the linkage lives in your database (referred account → partner) rather than in the browser. It's also what makes those "earn from every customer you send, whenever they upgrade" programs possible.
The design decision is the window: does a signup from March that converts in fourteen months still credit the partner? Pick a horizon that matches your real conversion curve — if 90% of upgrades happen inside six months, a 6- or 12-month window is generous and bounded — and publish it. Unbounded windows sound partner-friendly but quietly build a liability tail you'll dislike in year three.
Model 2: pay per lead, full stop
The partner earns a fixed bounty — $2, $10, $40, depending on your economics — for each qualified signup, regardless of what happens later. Simple to explain, instantly rewarding for partners, and it moves all conversion risk onto you.
Per-lead works when you know your funnel math cold (signup-to-paid rate stable enough that a bounty is just pre-paid revenue share) and when your fraud posture is strong — because paying for free signups is an open invitation to bot registrations and incentivized junk. Qualification criteria are the whole game: verified email at minimum, and ideally an activation event (created a project, completed the first lesson) rather than a bare registration. Hold lead bounties long enough to check quality in aggregate; a partner whose leads never activate is a partner you're paying for noise.
Model 3: the hybrid — small bounty now, real commission later
A token per-lead payment ($1–5) keeps partners motivated through the gap, and the meaningful commission arrives when the signup converts. This mirrors how the value actually accrues, gives new partners early proof the program pays, and keeps the fraud ceiling low (junk leads earn pennies, not dinners). The cost is explanatory: your program page now describes two numbers and two timings, and your reporting must show partners both cleanly. Worth it for funnels with long gaps; overkill for a two-week trial.
The mechanics that make any model work
Whatever you pay on, the referral record must attach to the account, not merely to a browser. Concretely: the tracking parameter or coupon code present at signup is written to the user record, and the later upgrade event looks up that record. This one implementation detail is the difference between "our free funnel credits partners reliably" and a cookie-length lottery. If part of your funnel runs through forms (a lead magnet on WordPress feeding a course checkout elsewhere), carry the referral through the form into whatever system completes the sale — a hidden field is enough.
Then tell partners the rules in their language: what triggers money ("qualified signup" defined precisely, "paid conversion" including which plans), when ("bounties approved after activation review; conversion commissions after the refund window"), and how long their referral lasts ("signups credit you for upgrades within 12 months"). Free-to-paid funnels have more moving parts than a cart — the programs that thrive on them are the ones whose partners never have to guess which part pays.