Looks like ING has upped their referrals back to $100, most likely targeted (as that's how it has been in the past).
Here's what it says in the email I received:
ING is Australia's most recommended bank.
So if you've got friends yet to discover ING's great value, send them our way and you could bank a $100 reward - each!
This is what is required (before the 31st of July):
Go to ing.com.au/everyday, open a new Orange Everyday and enter the promo code in the promo box at the end of the online form - this part's really important otherwise neither of you will get your reward!
Deposit $1,000+ (such as your pay) from an external account into your Orange Everyday account within any calendar month.
Open a Savings Maximiser (if you don't already have one) and make a deposit into this account.
Make 5+ settled (not pending) ING card purchases using your new Orange Everyday card within any calendar month.
More information: https://campaigns.ing.com.au/refer-jun