Providing your logistics partner Australia Post the IOSS number correctly ensures your shipments are handled appropriately.
Sending an IOSS order with Australia Post
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Log in into your MyPost Business account and choose menu item “Orders”
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Choose “Add an order” for single parcel dispatch (bulk import via csv is not described here , but
it is a straightforward process and can be followed by choosing “Bulk import”)
3. Fill in send-from information
4. Start filling deliver-to section and when a foreign destination is entered the form expands to include customs reference data fields.