They've always paid. The last time there was a long gap OZ was out of country. BUT I did get my full payment when promised.
This site has been one of the easiest to get in contact with WM.
If you're lost or want to know something quickly... go to
http://www.ozconsortium.com/forum/ fastest results I've gotten so far are from there.
It amazes me how people think if you request payment you should get it right up front in 10 secs flat! Not trying to be rude but I've see a few posts around abt not getting paid by FB even though they redeemed in the middle of the month or AFTER the 1st.
Read the terms usually they're very clear abt payments. I know when it's your first payment you can get worried.