I used the online booking tool for a DONE4 out of ICN. As I was flying to Helsinki on the first segment, the ticket was issued on Finnair stock. I booked the itinerary on a Thursday and recieved confirmation immediately but by Monday it had still not ticketed.

I called them and they said the ticket would issue in the next 48 hours. Given that some time had already passed, I decided to change the credit card used in order to maximise the payment due date for me. They were happy to make the change. The ticket was issued a couple of hours later.