I’m stuck at
“Please authorize this purchase with a quick security check”
I tried first on the app and then on the actual web page
I’ve cancelled the first on after 10 min and the web page after 20 min
My payment details have not been changed in 12 months
I was looking forward to Wow over Christmas 
Try removing your payment method and adding it again.
Hey there Bigpopa!
Dottie’s suggestion will work in many cases where your old payment profile is out of date.
If you’d like to try again please add your payment method here : https://account.blizzard.com/payment using a different internet browser, and typing the details rather than using an auto-filler.
You might want to consider using another payment method available to you, such as paypal and/or using this option, which is a one-off purchase of game time, as opposed to an automatic recurring subscription. : https://eu.shop.battle.net/product/world-of-warcraft-game-time
Have a Wonderful Winterveil! 
Just did it on a different pc and it was ok
I suspect it was my ad blocker