public static Customer GetCustomerByEmailCall(string Email) { const string simpleKey = "109ee846ee69f50177018ab12f008a00748a25aa28dbdc0177018ab12f008a00"; var api = new CustomerApi(simpleKey); string expand = null; // I'm only checking for existence, I don't need the expanded Customer object. var response = api.GetCustomerByEmail(Email, expand); return(response.Success == true ? response.Customer : null); }