PCI DSS

There are fewer better ways to help understand this complex guidelines, from a particular perspective, than to learn about how "real world" stakeholders have dealt with them. Thus, the audience needs to learn about some case studies. Research and discuss at least three actual scenarios in which a PCI stakeholder has dealt with, or failed to comply with, PCI DSS. Tell us some stories. Make sure to include at least three subjects

1. An online retailer

2. a small, local business and

3. a law firm, large or small.

* I need answer for only 3rd question with research Paper with live examples, references and presentation *