14.4. Summary
In this chapter, we created a way for our users to subscribe to our services. We have designed our payment handling framework generically enough to enable us to use any payment processor. We also created a concrete implementation to illustrate the entire process using PayPal.
It is important to note that there are several alternatives to PayPal and some are just as easy to implement. I used PayPal to illustrate the concepts because of its ease of use, popularity, and my prior personal experience with it.
Implementing a payment processing service is an excellent candidate for mocking. We are able to mock a payment without actually creating a payment. This allows us to create simple tests that are not coupled to a specific web service or vendor.
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