Throughout this chapter we have built a payment module with two payment methods. The card payment method is made so that it is simulating payment with the credit cards involved. For that reason, it includes a form as part of its getInfo method. The check money payment, on the other hand, is simulating a static payment method - one that does not include any form of credit card. Both methods are implemented as dummy methods, meaning they are not actually communicating to any external payment processor.

The idea was to create a minimal structure that showcases how one can develop a simple payment module for further customization. We did so by exposing each payment method via a tagged service. Using the payment_method tag was a matter of consensus, since we are the ones building the full application so we get to choose how we will implement this in the sales module.By using the same tag name for each payment method, we effectively created conditions for the future sales module to pick...