I'm presuming its a Form11 you filed.
If so 2 days after you filed, there should be a "Notice of Assessment" for each year filed available in your ROS inbox.
Once this is received the return will have been processed.
There is a payment option available in ROS and there is a refund option there, as far as I know, you put your refund amount in there and make it a refund case although I'm not100% certain.
I'd recommmend ringing the ROS support line for clarification