An example on how to add a customer to a customer segment

Add_Customer_To_Segment.cs

var customerSegmentResouce = new Mozu.Api.Resources.Commerce.Customer.CustomerSegmentResource(_apiContext);
var customerAccountResource = new Mozu.Api.Resources.Commerce.Customer.CustomerAccountResource(_apiContext);

var customerSegment = (customerSegmentResouce.GetSegmentsAsync(filter:"Name eq 'High Volume Customer'").Result).Items[0];
var customerAccountIds = new List<int>();
var customerAccount = (customerAccountResource.GetAccountsAsync(filter:"FirstName eq 'Malcolm'").Result).Items[0];

customerAccountIds.Add(customerAccount.Id);

if(!(customerAccount.Segments.Exists(x => x.Id == customerSegment.Id)))
{
    customerSegmentResouce.AddSegmentAccountsAsync(customerAccountIds, customerSegment.Id).Wait();
}