In my case, it appears my points for transactions shown as $0 dollar spent are for paying with my PC debit card and:
1) bringing my reusable bags (10 points/bag aka Points-for-Bags Program)
2) shopping at a non-PC Plus participating Loblaw store, like No Frills (5 points/$1 aka Supermarket Rewards)
3) also, shopping at a PC Plus participating store, like RCSS, Loblaws (5 points/$1 aka Supermarket Rewards)