Can a Plus user use !walls to automate dynamic lighting?

I'm a new Roll20 GM coming on strong because of Covid-19.  I've recently purchased a mapping tool that has "support for Roll20 dynamic lighting". So, when I export a PNG from the mapping application, it also generates a text file filled with "!walls" commands.  I *think* I'm supposed to paste that into the Chat, but when I do, nothing happens. So, either I don't understand what to do with that file, or I need to be a Pro user rather than a Plus user to use it. Can anyone confirm my suspicion that I have to be a Pro user to paste commands in the chat this way?

Hi Dan, You indeed require a Roll20 Pro account in order to use the API, and for the command you mentioned you also need to install the Walls API Script, which is pretty simple to do. Once you have a Pro account, you can go into your game Settings > API Scripts: Then search for walls:  and once you select it make sure to click on Add Script: With that it should work properly. Assuming I guessed the tool correctly, you can see the requirements and additional instructions on the F.A.Q. page . Cheers!