Hi
Depending on your card issuer, what you have described may be the normal, expected behaviour.
Devices are treated separately for Apple Pay. This is why you had to add your payment card(s) separately to each of your Apple Watch and iPhone (each combination of device and payment card is given a unique Device Account Number).
There is presently no transaction history feature on Apple Watch, nor does Apple Watch provide transaction notifications for payments made via the watch.
If the same payment card has been added to Apple Pay on your iPhone or iPad, then it is possible that payments made via that card on your watch may be included in the transaction history (the last 10 transactions) shown in the Wallet app on your iPhone or iPad.
Depending on your card issuer:
- You might see only transactions made with that iPhone or iPad, or;
- You might see all transactions made using that payment card account (including usage via Apple Pay across all devices and usage of the actual card).
If you would like Apple to consider adding new features, you can suggest them here:
https://www.apple.com/feedback/watch.html