Select "Hoolah Payments" when checking out.
If you're automatically logged on the "SHOP PAY", click on the arrow down at the row with your credit card details and select "Alternate payment methods"
   
Click on "apply voucher", scroll down and find the voucher that says "Mother's Day"
   
If you aren't able to find the voucher, you may still check-out and enjoy the discount automatically, which will be offset on your 2nd instalment.

Oakandsand's 10% discount code applies to all products except gift cards and mattresses. No min spend and uncapped.

Hoolah's 20% discount voucher applies to your order value after the discount above is granted. No min spend, capped at $20