Invitex app

I have another problem with Invitex app.
Invitex app generate discount code and send to inviters. Thats cool, but discount code can use everybody (I want use only for inviter) and for all subscribtions again and again(I want use only for specific subscription and only onetime).
Thats not so much cool. Maybe I have bad setting, please check attached file.
Can you help me?
Thank you
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