Got paid twice for a focus group

I did a jury study in May for $40. I signed up thru UserInterviews. I got paid on May 25th. But today I received another $40 for the same study? What should I do? I prefer to do nothing considering it's their mistake!

submitted by /u/mr_bojangles_jjw
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source https://www.reddit.com/r/beermoney/comments/1l8bk0k/got_paid_twice_for_a_focus_group/