First touch wins. If a browser already carries a partner cookie, a later partner link does not overwrite it. The first partner whose link that person opened keeps the claim.
The window is 90 days. The cookie expires after that. Someone who clicks your link and signs up four months later is not attributed to you.
One employer, one partner, forever. Attribution is written once, when the employer account is created, and is unique per account. It is not re-evaluated later and does not expire — an employer attributed to you in March still earns you commission years later, as long as you remain an active partner.
Attribution happens at account creation, not at first purchase. The employer has to actually create an Offerrole account while carrying your cookie. Sending someone a link they open on their phone and then signing up on a work laptop breaks the chain — the cookie lives in one browser.
Same-browser caveat. Private/incognito windows, cookie-clearing extensions and "reject all" consent choices can all drop the cookie. For high-value introductions, ask the employer to sign up in the same session in which they open your link.
You must be active when the account is created. A referral is only written for partners whose account status is active — that is, onboarding complete.
The partner help centre covers attribution, the ledger, payouts and the selling rules.