I tried using at Pavilion today.

One was at Starbucks.
Another was at Komugi bakery which has the Samsung Pay logo.
J.CO Donuts & Coffee also has the logo but requires my signature on their copy of receipt.

Bookstore MPH accepts Samsung Pay. I used at the 1Utama outlet as it has the logo there.

Tangs 1Utama said they accept but my transaction timed out on their Maybank terminal. I didn't retry and used physical card instead. Maybe others might have different experience and result.

Watson 1Utama had problem with payment using Samsung Pay. They help me try 4 times before saying their terminal not configured properly. It was a Maybank terminal.

Tried to use at Kinokuniya @ KLCC today but didn't work. When I mentioned Samsung Pay the cashier asked which card; Visa or Master. Then when I tapped my phone on the terminal it didn't beep or anything. He helped to try again and also put my phone on top of the terminal but still nothing happened. In the end had to use physical card for wave. I think it was a PBB terminal.

Funny thing is, in the Samsung Pay app it listed Kinokuniya as a Pay friendly merchant.