Sir, I confirmed with Samsung Tech Support and they did confirm M40 comes inbuilt with KNOX and is secure to use fin apps and the likes. I posted this answer to another similar discussion.

I had a chat with Samsung Tech Support and they confirmed it is inbuilt with Knox - Samsung M40 is integrated with HW level knox security and we are safe to use and payment related and other sensitive apps. Just thought of adding it here as I see a l...