I used the SDK some times back 2020. The link https://www.dropbox.com/sh/pznvlzx8qx5nfr3/AABpzhSyjqH0qWNYgMvxqAA9a?dl=0 still available and looks like they update the SDK occassionally. Wrote to them about JAVA intergration then, ended up up doing it myself. They now have JAVA intergration library.