So I did it ! I used my Coupgon app at the Co-op store !
At home I chose a few coupons I might like to use.
In the line up, I chose "redeem".
I brought up the DelMonte buy one get one free coupon.
Once clicked, the screen changes to camera ( or it sure looks like it)
The scan code thing is there at the cash, and once I had it in my screen, the screen changed to a coupon, which I showed the cashier.
She said good, I pressed ok.