Just found this website.
Have to do a bit more homework when I get some time
Cost varies foe number of employee. 
$5 PM for up to 5 employees
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e-PayDay® SuperStream Gateway EP05 (up to 5 Employees) Monthly Subscription
Category: 
Store
 > 
SuperStream
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SKU EP05EDI
In stock
was 
AU $9.00
AU $5.00Save
44%
Price incl. GST
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The 
e-PayDay® SuperStream Gateway provides an easy to use portal for uploading contributions data. Pay a flat monthly fee, cancel anytime.
The facilities available include;
- Payment by EFT from your bank account – no third party direct debits.
 
- Payment using American Express – enjoy extended payment terms as well as rewards points.
 
- Uploading monthly or quarterly contribution remittance information.
 
- Receive notification by email of responses from funds and also for any errors encountered in your data.
 
- Display/download a Payment List by fund for checking or making the payments prior to releasing the remittances to the funds.
 
- Automated transfer of payment details to American Express payment portal.
 
- Access to history of files sent and responses. Contribution details are available for as long as required.
 
- Access to Fund Validation Service allowing searches for superannuation fund USIs to assist in data validation and readiness to receive.
 
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