Oh wow. Just been reading; for a #PayID payment into a #Westpac account the period whereby the sender can claim it was a Mistaken Internet Payment is.... wait for it... 7 months!!! You can be scammed 7 months after receiving payment. And the best bit, the banks might not even tell you, they just accept each other's word and transfer the money back.
I am learning lessons this week.
Section 6.19 of their Online Banking T&Cs

@phil That’s nuts.

Should be the same as credit/debit card chargebacks; and require the same level of proof and response, with the claimant being liable for costs if their claim of mistaken payment is deemed wholly false.