Monetization - How do I know when I sell and app ?

I've setup my merchant account, uploaded an app and even sold (at least) one instance. I know this as I've been in discussions with the purchaser. 

I have had no notification from Garmin, nor can I see any sales in the Dashboard (or at least I can't find where to look).

How do I know when I sell an app ? How do I confirm that all sales are accurately recorded and that my share of proceeds are actually sent to me at the end of the month etc..

How do I know who my customers are in case they contact me. I may want to offer paying customers a different service to non paying customers ?