MarketPress: What's a product ID?

The shortcodes are great! Some of the shortcodes need "product_id" - The ID of the product to display.

But there is no reference to how to find that id! :slight_frown:

And it doesn't display anywhere (I checked under Products > Products hoping it would show up as a field on the list, but nope.

I did find out that product_id actually is the post# (took me a little while to clue in) but it would be nice to see this in the manual, or indicate the post# as product_id on the listing somewhere.