Payment error: Wrong zip code (but it's not), payment approved, card charged, NI order cancels

Alas support is too long time answering at the moment especially because you want to buy during the sale. It's impossible for me to tell why it does as it does , there has though been seen somewhat similar experiences with credit cards that had somehow been flagged somewhere for something..

Only real advice I can give is to try to use PayPal as go between to see if that makes a difference. If necessary using the Guest Checkout option? (I do not know if that is still an option at PayPal but you could try as described below ! )

Checkout: Select a payment method. In this step, "select Proceed to PayPal".

Select "Pay with a Bank Account or Credit Card" If you are not registered in PayPal, select "Pay with a Bank Account or Credit Card".

Insert card's details. ...

Choose to create or not an account.

P.S.

Please notice that repeat use of pending payments may result in that you do not have enough money on card.

Also please notice that I can not take responsibility for you making same purchase more times if that is how it turns out. Though you might get a return from N.I. though I couldn't say if and how !

Sorry , I don't know Apple Pay , I only use PayPal of that kind of services !

Let's hope that @Jeremy_NI can accelerate your support request before the sales is finished !

(@ Big Picture Sound , that just tagged Jeremy to come take a look tomorrow when he has time !)