Can the merchant void or refund a transaction? | 香港電訊 HKT

VISA / MasterCard / AE:Void at SmartPOS terminal. Refund at bank portal.
AliPay:Refund only
WeChatPay:Refund only
UnionPay/Quickpass: Void only
Tap&Go:Refund only
FPS:Refund only
Octopus:No