It's possible to send invoice outside Sweden, but the only currency available is SEK.
One of the reasons why it is not possible is due to accounting reasons and that it takes longer to receive foreign payments. Exchange rates can change and we can't pay a higher amount than what is stated on the invoice. Therefore, we have chosen that these payments go directly to the creditor of the invoice, so you can mark the exact amount you receive in your bank in SEK as cash payment in Billogram.
Another reason is that we can only match payments against the correct invoice that goes through Bankgirocentralen, there is no support for IBAN payments in the same way.
If your invoice receiver needs the amount to be specified in another currency, one solution is to add it as a message on the invoice. You can do this under Additional information → Message.