We are really glad that Easy AR was updated to 3.0, but we don't have any documentation for Unity API, also it's really unfortunate that it removed some basic functionalities, like rendering the background plane, that is the most important part of Augmented Reality. How can we make an AR app if we don't have a background image? In the changelog it says "use CommandBuffer to draw camera background in Unity plugin". Most people don't even know what that is and even if they know, it's really unfortunate that they need to make their own scripts for such an important feature, especially without a proper API documentation.
You need to provide an API documentation if you want people to use an SDK. At least provide samples for such basic functions, such as camera background.