Thanks for replying and making clear what should have been included in my original post.
That amount ($700) was made over 2 trades (4 transactions), one short and one long.
I opened and closed both positions in the same trading session (i.e. intraday).
CommSec also says it only charges 0.10% commission.
In its example trade on its Website, they just calculate this (0.10%) commission, but then add, at the very bottom (of course): "Please note funding costs will apply to this transaction."
The trade wasn't DMA (if that's of any relevance).