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1) B-Pay. My B-Pay Biller Code is 5082, but this could change for different types of cards. Your account number is your card number.
2) Australia Post/Australia Post billpay. Code 0886, account number is your card number. Code could change for different types of cards.
3). Direct Debit. Need to set it up with Amex.
4) Cheque. Post it off to Amex.
5) In person @ Amex or Post OFfice or Suncorp. A handling fee may apply ($2)
I am sure you have your reasons but assuming you pay the balance off in full every month why not wait for the statement to arrive and then you have around 20 days top pay off the balance. Wouldn't the money be better off in your pocket until the statement is required to be paid?
I know i often randomly pay my Amex during the month as i am not home that often and just make sure i do it between trips, i hate the way Amex shows the current balance, its teriible, all the banks do it much much better !