Glossary
DOI
A conversion counted only after the user confirms: clicks the link in an email, enters an SMS code, completes a second step. Fewer conversions than SOI, cleaner leads, higher payouts.
Also called: double opt-in.
DOI proves the contact is real and the person meant it. Dating, gaming and finance offers use it, and email-based advertisers need it to keep their sending reputation.
The affiliate loses the leads that never confirm, so a DOI funnel is tuned to get the confirmation: a clear instruction on the thank-you page, an email that arrives immediately, a reminder.