Hi
It is not possible to view a consolidated record of all prior Apple Pay transactions from, potentially, multiple devices.
Confirmation of transactions is instead provided in due course via your card / bank statements, as it would be if you were using the payment card(s) directly.
Apple Pay does not collect any transaction information that can be tied back to you. Payment transactions are between you, the merchant (or the app developer for payments made within apps) and your card issuer.
However, some historical transaction information may be available from your card issuer via Wallet - follow the instructions here to view it:
If you would like to submit a feature request to Apple for any other functionality, then you can do so here: