public abstract class DemoTool{
  // references to domain services and use

  public Guid CreateConsumer(string email, string password){
    return _userService.CreateConsumer(new ConsumerCreateRequest{
      Email = email,
      Password = password,
      ConfirmPassword = password,
      /*other property assignment*/}
    ).Id;
  }

  /*methods for creating inventory, transactions, categories, etc...
    All take Guid identifiers for references and return Guid identifiers as results*/
}