Where is my 'Wallet' app (ios8.4) This may be a UK problem, Apple pay was launched in the UK today and it coincided with an update to ios8.4.

But I still have Passbook.. Is there a way of turning on wallet or has it simply not been launched in the UK yet?
The Wallet app is coming with iOS 9, and is not yet supported in iOS 8.4.

I've tested iOS 9 in Germany, and it will be supported in every country. They 'just' changed the name (and introduce a collective place for Apple Pay in the future).

Source