26.6. NextGen POS Conceptual Class Hierarchies
Payment Classes
Based on the above criteria for partitioning the Payment class, it is useful to create a class hierarchy of various kinds of payments. The justification for the superclass and subclasses is shown in Figure 26.7.
Figure 26.7. Justifying Payment subclasses.
Authorization Service Classes
Credit and check authorization services are variations on a similar concept, and have common attributes of interest. This leads to the class hierarchy in Figure 26.8.
Figure 26.8. Justifying the AuthorizationService hierarchy.
Authorization Transaction Classes
Modeling the various kinds of authorization ...
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