I used the random Afterpay referral exchange on OzBargain to sign up for Afterpay yesterday in order to get the $30 off my first transaction but when I purchased the item, I did not get any price reduction and when I complained to Afterpay about it, the customer service rep said "Please send us the email address of your friend who referred you so we can further investigate."
Of course I don't have that information as the referral code exchange does not provide that and in fact I didn't even bother writing down the referral code I was given by the OzBargain randomised exchange.
I've edited this post to remove any request for a referral with email address but I would strongly advise OzBargain to remove the referral code database for Afterpay to avoid other people experiencing the same problem I did.
You're not the only person to have this problem.
My suggestion would be to contact a moderator and see whether they can help you out.