// Go to the "Cheat sheet" tab or https://docs.zenuml.com

// to find all syntax<br>

// `POST /v1/book/{id}/borrow`

BookLibService.Borrow(id) {

  User = Session.GetUser()

  if(User.isActive) {

    try {

      BookRepository.Update(id, onLoan, User)

      receipt = new Receipt(id, dueDate)

    } catch (BookNotFoundException) {

      ErrorService.onException(BookNotFoundException)

    } finally {

      Connection.close()

    }

  }

  return receipt

}