used comet coins
Next up:
Download app (specific referral link is not necessary)
In promo section of app enter code: m8e29
Once code is entered, the bonus will show as "Referral Bonus Pending" $5 under "History". There will be 2 separate $5 entries recorded for this. Each of the first 2 rides will give $5 bonus immediately after completion.
Stackable promos (but make sure referral code is the first promo code you enter):
"5for5" and "URBDAY1" did not work for me