@anon33247966 From FAQ: "Topping up in USD/ PLN/ CHF/ SEK/ NOK/ DKK/ RON/ AUD/ NZD/ SGD/ HKD/ ILS/ TRY/ AED/ CAD/ HUF/ INR/ JPY/ MAD/ MXN/ QAR/ THB/ ZAR:
Please ensure the reference/description for your transfer is the 8-digit reference number highlighted in pink on this page with no other text."
What about CZK? 
Hi there.
We’re looking into the possibility of adding CZK. It’s hard to provide an ETA rest assured, we will keep you posted 
@anon33247966 Well, but I think that the CZK SWIFT transfer and CZK wallet is operational since October, but in the list of currencies in the FAQ (see above) CZK is not listed :-).
I was referring to top up with card We will edit our FAQs.