Sure, no problem.
And it's mentioned very briefly in the tutorial. It's a string of 9 characters (Yes, I know there are more efficient ways to represent it. But if I gave it as an integer that would ruin half the fun
).
Which, from top-left to bottom-right is:
Which is finally:
You always play as X for simplicity (my server flips the board for the second player).
Out of curiosity, which API are you using?