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Okay, this might not work for everyone, but it did for me. If it works for you, GREAT!
I am a regular user of Ibotta. I signed in to take a look at the specials going on and one of the banners showed a $ 5 for $ 10 Starbucks Card through Groupon. I clicked on it, it took me to Groupon and I had no problem claiming this INVITE ONLY deal.
Then, when I checked my Ibotta account a little while later, I had received $ 7 in Ibotta earnings, $ 5 for claming one online offer and another $ 2 for completing the summer online offer (or something like that).