On the payment page it now says credit card info saved to one's Finnair Plus profile before 9th of April 2025 has been removed during system maintenance.

Would not be a big deal but for some reason until now, I have been able to avoid the 2,5% surcharge on my Amex by using the card info saved on my profile. Somehow Finnair thought it was a debit card that I had saved. Adding the same credit card details without being logged in ticked the 2,5% surcharge as expected.

I calculated having saved more than 1000€ in the last years by avoiding the stupid credit card fee, but that bug is unfortunately gone now.