Signed up to DiDi recently and received this deal which is activated upon taking a trip and valid for 14 days from then, with the 50% off vouchers expiring after 5 days, not valid 7am-9am Monday-Friday, and exclude tolls, levies, other 3rd party charges
Combining this with the 2 x $10 vouchers via referral and 8 x $5 off for new users, it means that one can take 7 discounted trips within 14 days:
1st ride - $10 off
2nd ride - $10 off
3rd ride - 50% off (up to $25)
4th ride - $5 off
5th ride - $5 off
6th ride - $5 off
7th ride - $5 off
To be given 2 x 50% off vouchers to use within the next 5 days:
8th ride - 50% off (up to $25)
9th ride - 50% off (up to $25)
50% off can make a trip to the airport less than $25 from the CBD :)
I used this in Melbourne recently, ended up taking a car to the airport. cost me 22 dollars for two people with 50% off, rather than 50 for the skybus