// Update a Insurance Policy with the UpdateInsurancePolicy method
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.UpdateInsurancePolicies(new BFSServiceReference.UpdateInsurancePoliciesRequest()
{
    Credentials = credentials,

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

    Fields = new UpdateInsurancePolicyFields()
    {
        BrickId = true,
        Premium = true
    },

    Entities = new[]
    {
      new UpdateInsurancePolicy()
      {
          BrickId = new Guid("15b1f034-c9b9-4747-a03a-5bb06edd0ad1"),
          Premium = 100M,
      },
    },


});

foreach (var c in response.Entities)
{
    Console.WriteLine(c.BrickId + ", " + response.Message);
}