Refund request Apple Pay

Merchant charged me wrong amount in POS (Apple Pay transaction)

we then proceeded by doing a refund through the POS which we used Apple Pay again for that transaction. POS accepted and receipt of refund was printed as well.

However I have not received anything through my phone about it. In the history of my Apple Pay transactions it doesn’t appear.

Question is, was I supposed to get a notification about the refund? If yes, does it take time? Or will I just wait for the amount to appear in my bank statement? Because I haven’t received anything back either.