Hi, Mark

Since food products, GST is 5.5% check!

GST need be paid on total Net Sales ( excluding GST component )  that is 

Create an Invoice for Total Weekly Sales $4,420.15 ( Gross Sales including GST component )

GST Component is $4,420.15 / 105.5 * 5.5 = 230.43 as GST 5.5%

Note: UberEATS Marketplace Adjustment $244.94 I am not sure about this adjustment if it is Sales GST needs to be paid & invoice is created instead of Sales receipts

Then create a bill for 1,547.49 ( assumed Net amount i.e excluding the GST compnent 10% )

GST on UberEATs Fee -$154.93  ( 1,547.49 * 10% = 154.75 due to average/round off error so you enter as the GST on UberEATs Fee $154.93)

Now post a journal entry to offset UberEATs fees i.e 1702.42 and apply the credit to the Customer

Debit  Accounts Payable select Vendor Name  UberEATs

Credit Accounts Receivable select Customer Name ????? ( if many customers then create a customer called Retail Customers )

Apply the credit to the invoice which will reduce the amount customer owes you.

Comment back for further clarifications / to discuss.