No mention of BPay facility, probably because Registries don't have the facility to make it available.
"The completed Application Form together with a cheque or money order made payable to “Eastern Star Gas Limited” and crossed “Not Negotiable” for the amount payable with respect to the amount you are investing, should be received by Registries Limited (Registries) by the Closing Date. Registries' address can be found on the application form."