//Create BankIdSign
var client = new BFSServiceReference.bfsapiSoapClient();

var credentials = new BFSServiceReference.Credentials()
{
    UserName = bfsusername, //Username of administrative user in your instance of BFS
    Password = bfspassword, //Password of the administrative user in your instance of BFS
};

var response = client.BankIdSign(new BFSServiceReference.BankIdSignRequest()
{
    Credentials = credentials,

    identify = bfsidentifier, //Identifier is a unique token for your instance of BFS    

    BankIdType = BankIdType.Mobile,
    Domain = Domain.Admin,
    PersonalNumber = personalnumber,
    SigningText = "The signing text"
   
});

Console.WriteLine(response.OrderReference, response.AuthToken, response.BankIdType, response.PersonalNumber);