You must link your credit card/prezzy card etc(but can cancel the day you register and still qualify).
https://www.lightbox.co.nz/settings/subscription
2 x Big Mac®
2 x Cheeseburgers
4 x Small Fries
2 x Medium Soft Drinks
2 x Small Soft Drinks
It also qualifies you for the lightbox competition posted here: https://www.cheapies.nz/node/3082
Lightbox McDonald's Promotion Terms & Conditions
Subscribe to Lightbox between 27 August and 6 September 2015 to get a free Macca’s® Value ShareBox™ voucher worth $20.
Available to customers new to Lightbox who subscribe between 27/8/15 and 6/9/15. One voucher per household. Must provide postal address at time of subscribing for voucher to be sent to. Vouchers will be sent from Friday 4th September, please allow 7-10 working days for arrival. Lightbox takes no responsibility for lost, stolen or destroyed vouchers. Vouchers subject to McDonald’s terms, must be used prior to 31 August 2016, and cannot be exchanged, or redeemed for cash.
Very nice deal, same as the Hell's pizza last year.
I've updated, it is infact a freebie, you can remove the sub as soon as you get the voucher, which wasn't a problem last time. Whether someone remembers or wants to remove the sub is up to them.