public static string CalculateIBANCheckDigit(string bbanNumber)
{
string bbanNumberWithCountryCodeDigits = bbanNumber + NumberUtility.CalculateCountryCodeDigits("FI") + "00";
string checkDigit = NumberUtility.AddPadding((98 - BigInteger.Parse(bbanNumberWithCountryCodeDigits) % 97).ToString(), 0, 2);
return(checkDigit);
}
// This method takes in four parameters: IBAN account number, invoice total sum, reference number (in Finnish domestic or in international form)
// and a due date. It forms a virtual barcode that can be input into bank applications.
public static string CreateBarcode(string ibanNumber, double invoiceSum, string referenceNumber, DateTime dueDate)
{
// Add IBAN account number and invoice sum to the barcode
string barcode = ibanNumber.Remove(0, 2) + NumberUtility.AddPadding(Math.Round(invoiceSum, 2).ToString("F2").Replace(",", ""), 0, 8);
// Add reference number to the barcode
if (referenceNumber.Substring(0, 2) == "RF")
{
barcode = "5" + barcode + NumberUtility.AddPadding(referenceNumber.Remove(0, 2), 2, 23);
}
else
{
barcode = "4" + barcode + "000" + NumberUtility.AddPadding(referenceNumber, 0, 20);
}
// Add due date to the barcode
barcode = barcode + dueDate.ToString("yyyyMMdd").Remove(0, 2);
return(barcode);
}