How it works:
Alibonus is a cashback service initially launched for the Russian community however it has been translated into English and as of recently you can also withdraw earnings using Paypal.
After you make an account on the alibonus.com website you have to install the Firefox/Chrome plugin which when activated tracks your Aliexpress purchases through an affiliate link, in return earning you cashback for your purchases on Aliexpress.
Alibonus gets paid when you purchase something on Aliexpress and then they share the commission with you from Aliexpress.
All earnings are put on pending at first as Alibonus has to wait for those orders to be confirmed as received first then they receive their commission from Aliexpress and then you can finally withdraw your earnings.
My referral link. I receive 20% of any cashback you make in the first 6 months of joining.
Note: I think you need to spend about US$2400 to reach the 10% level of cashback. Some comments/discussion here:
https://www.ozbargain.com.au/node/291792