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I want to invite my friends and get bonus, but...

a month ago
I have some friends who are interested to take Indonesian lessons with me and I want to invite them so that they can get $30 bonus and I get $15. I invited a friend and the referral program worked well (we got the bonus in one hour), what I'm wondering is...

Will the $30 bonus still available if a new user redeem their "free trial lesson"? Many of them want to take the free trial before buying 10 bulk lessons and get the bonus. Or should they buy the bulk lessons right away?