Little India offers a $20 for joining their Little India VIP Club and completing some information. Little India is located all over New Zealand. According to huntakillaz, your bill must be $50 or more to use the $20 voucher.
TXT: curry (space) your email address to 4664
$20 Voucher when you complete your profile 50 Bonus Points - This will be automatically applied to your account when you refer a friend and they confirm their email $20 Voucher when you earn 200 reward points
As per the other EFTPlus deals, only sign up when you know you will be visiting the venue as the deals often have a short expiry once you register.