How does information assurance applied in assuring that debit and credit card information

Information Assurance (IA) is the practice of safeguarding information and managing risks related to the use, processing, storage, and transmission of information or data, the systems and processes used for those purposes. In financial industry, how does information assurance applied, in assuring that debit and credit card information and other financial information is protected.

Discuss the weaknesses in these systems and how to improve them.