When an invoice is sent overseas you will need to complement your invoices with payment instructions that make it possible for a foreign payment. It means that in these cases it is not enough with Bankgiro or Plusgiro, but you would have to complement the invoices with an IBAN + BIC/SWIFT and/or the name of the bank and account number.
BIC/SWIFT: An identifier for your bank.
IBAN: Your account number for foreign payment.
Please note that some banks release an account number instead of an IBAN number, this is called "BBAN", which works just as well. BIC/SWIFT is then set to the bank’s full name.