Login to your account and add offer, both offers appeared on my Explorer and Plat Charge (Spend $99, Get 2,000 Points).
Red Cross - Spend $50, Get 1,500 Points
Save offer to your eligible Card, spend $50 or more, in one or more transactions, online only at donations.redcross.org.au by 31/12/2017 to get 1500 Membership Rewards Bonus Points. Limited to first 5,000 Cards to save offer. Exclusions apply.
Offer Terms
Excludes purchases of raffle tickets.
Offer is limited to 1500 Membership Rewards Bonus Points per registered Card. Only spend on the Card number you register counts towards the Offer.
Excludes transactions where you do not spend directly with your eligible card at Red Cross Online at donations.redcross.org.au. Offer valid at Australian website only.
Excludes transactions made through a third party establishment or payment processor.
You must be enrolled in the relevant loyalty program and have an active loyalty account to receive the points.
Supplementary Cards are not eligible for this offer.
Points are not redeemable for cash.
Points should appear on your billing statement within 5 business days from qualifying spend but may take up to 90 days from offer end date.
Points will not be applied to your Card account if your Card has been suspended or cancelled.
Points may be reversed if your qualifying purchase is refunded or cancelled.
I think there's been some copy/paste issues here ($50 spend? or $100?). In any case, it's neither $50 nor $100 spend on my cards, but $99. The points bonus offered is not 1500, but rather 2000 (for my cards at least).