You need to ensure you have AUD set as a currency in your admin as ESEC/Securepay requires transactions in AUD.
Current ESEC Customers please not that you will need to contact ESEC/Securepay and ask them to swap you over to the Securepay gateway as opposed to the ESEC one as this module will not work on the old ESEC gateway.
Also note its very hard to get a straight answer out of ESEC/Securepay as ESEC was taken over by Securepay and there is still confusion
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