IO document function lets you attach insertion order document as a sign of commitment on a specific offer between you and your publisher.
It is managed on each offer separately in admin panel side and is displayed on offer level in partner panel accordingly.
Once IO document is attached by affiliate manager, it is supposed to be signed by an affiliate and reattached back when requesting the access to the offer tracking URL.
An affiliate manager will be able to review the signed document through the ticketing system in Affise: Tickets > Tickets list > 'Offer request' ticket type.
The flow above is most commonly used for the offers in Pre-Moderation status, when an affiliate is supposed to request the access to the offer tracking URL through the partner panel in Affise. Despite the fact that IO document is attached to the offer, all publishers can run a public offer while only enabled affiliates are able to get offer tracking URL of a private one.
Should you have any further questions or concerns on the matter, feel free to reach out to firstname.lastname@example.org.