hi
@eps I use google play service. I actually didn't write my code for it, the wonderful B4A coder
@Computersmith64 helped me out on that, h'es put google play service to good use in his games, like Five Dice, and they work well. He also helped me with achievements. There is some good sample code in the forums though if you look up leaderboards in the search box.
Anyway, need to do my day job (and sneak in game programming too)
Just a side note, I love using Trello for my task lists for my games. It has a mobile app too, so if you think of something, or a fix for a bug then you can write it on the list on your phone wherever you might be.