Found this on Twitter the other day. All I had to do was link my credit card to the offer and then I was able to get a $1 off my purchase later that day (shows up as a credit on your CC statement) .
I went a 2nd time later the same week and this time with a coupon and I still received my $1 back on my credit card statement .
Looks like it's good until the end of the month. Check it out: