This didn’t work for me in the UK when I tried with another custom a while ago.
May have a look into it to see if it’s working again.
I did find this but I’m assuming it’s for ZIP themselves rather than Quadpay even though they apparently own it.
Edit: Doesn’t work for me on the custom store. It does with Paypal for the main store.
@SaintSovereign is it possible the UK or so could get a Paypal pay in 4 on the custom store like with the main store?