What do i get from inviting someone into prolific?

What do i get from inviting someone into prolific?, if they register and complete a few?

i couldnt find anything about this, btw sorry for my terrible english lol

submitted by /u/Zyzz_Biren
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source https://www.reddit.com/r/beermoney/comments/eyotuy/what_do_i_get_from_inviting_someone_into_prolific/