Create an account with your invitation code, subscribe to a premium package for at least 5 days and you'll receive 5 extra days and 50 points to your account. You can trade in 1000 points for 30 extra days.
Our members haven't found much information on Gappx's current referral program. Feel free to submit more details or clarify Gappx offers for other members' benefit.
Refer one friend, you get 10 extra downloads. Invite two, you get unlimited downloads. Your friend also gets 10 extra downloads.