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You should pay the reviewers first, that way you can be certain the review is genuinely honest.
that is risky . how can he know that he wont be scammed ? paying first wont guarantee that the given review is legit and honest .
He just need to deal with trusted forum users and there will be no problem at all paying first. Most newbies nowadays won't get trust from any users here in the forum so newbies will need make some adjustments if they are legit