I've just realised, and applied for, the refund.
I've already got my debit card added to Apple Pay, and I've been using it regularly for payments, just not on the tube. I've been reading on iMore that:
Although I'm confused how Apple Pay can work out your remaining balance on your Oyster Card?
I've also had on he TFL website that:
I assume I would need to add the same contactless debit card on the TFL website, that I use with Apple Pay? Would I have to sign into the website to view this, or would the information be available elsewhere?