Do you have a source for the payment expected 90 days after prescription? In the June 2019 quarterly it states "Initial deposit of AU$95k received by the Company from Cannvalate for its first orders"
To me that makes it seem that the distributors pay for the product prior to reselling to patients. This quarterly I think we should expect to see the remaining ~$205k due from those first orders since they also state in the June 2019 quarterly that "Pharmaceutical product purchase orders received in the first month of operation totalled ~AU$300k (equivalent to >1,000 prescriptions)"
