Even going by this  BIS Review 42/2009  1  working definition, what clearly emerges is that the user base for retail payment systems is very large as they touch every economic activity in the country and even cross-border transactions of such nature.
These models are reviewed by a group of experts inside the Fed but outside the stress testing process that challenges their assumptions, further improving their credibility. The models span all material exposures held by banks, providing a comprehensive assessment of the risks different types of scenarios pose to overall bank capital.