Having quickly read the ATO site on GST free services the OP would be lioable for GST.

1.

Sales in the course of operating your business

For a sale to be taxable, you must provide the goods or services as part of conducting your business.

2.

Sales connected with Australia

GST applies to sales that are connected with Australia, whether they are goods, property or other things

3.Things other than goods or property

the seller makes the sale through a business they carry on in Australia