Just saw this from Shopback website.
Earn $2 Bonus Cashback for Any Woolies Gift Card Purchase from Shopback
Terms mention one bonus only so not sure it is able to get another if you have one I think like last month.
Terms and Conditions
- To qualify for the $2 Cashback Bonus, you must purchase a WISH gift card of any face value from Woolworths Gift Cards between 18 May 2019 12:00 AM - 18 May 2019 11:59 PM AEST through ShopBack.
- The $2 cashback bonus will be credited separately into your ShopBack account by 4 June.
- Limited to one bonus per qualifying customer.
- Accounts that engage in fraudulent activities will be banned and ineligible for the bonus offer.
- Customers must redeem at least $10 confirmed Cashback from general purchases in his/her Cashback account to withdraw the $2 Cashback Bonus.