Texture not completely transparent after applying transparent shader?

Hello, this is my first time applying a transparent texture so I’m lacking a lot of basic knowledge, I’m trying to apply a transparent hair texture to a plane using nodes, when I render or view the object there’s a semi transparent white color> How do I turn it completely transparent?

On a sidenote if anyone has experience; what’s the best way to export cycles materials to a game engine (Unity to be particular).

Thanks!