This instrument sets the exchange rates for currencies by country.  The start date is 1 January 2019.

The instrument operates to specify, under paragraphs 5.36(1)(a) and 5.36(1)(b) of the Regulations, in relation to the payment of a fee, as defined in subregulation 5.36(4) of the Regulations (other than a visa application charge (VAC) payment to which subsection 5.36(3A) of the Regulations applies), the places and corresponding currencies in which those fee payments must be made.

The purpose of the instrument is to undertake one of the biannual updates of the places and corresponding currencies in which payment of a fee may be made.

Source: Migration-LIN-19001-Payment-of-Visa-Application-Charges-and-Fees-in-Foreign-Currencies-Instrument-2019.pdf