There are several factors which may make you declined for a credit card - Do you have a high income? Do you already have an AMEX card? Have you applied for other credit cards over the last 12 months? As the card is issued by Amex now, its an Amex decision rather than a Westpac decision.

I haven’t received an invite despite spending 400k per annum on the cards. Possibly my spending profile isn’t profitable, as I spend a lot with AusPost and Google AdWords.