Currently available via PrivatBank card. To replenish you need to transfer any amount to the card (payment info should not be changed to prevent payment block)
4149 4390 0371 1862 ($1 = 100 gold)
and then write in support the date, time and amount of payment.
Top-up works from any country. If you don’t have a bank card, you can make a transfer through the self-service terminal (enter the specified number and insert money into the terminal).