CRS-IUA is an extension of CRS-M. CRS-M that provides a front end for WebKit-enabled browsers along with configuration and code extensions that provide functionality to further support its display on mobile browsers.
At a high level, CRS-IUA consists of three parts that work together to provide remote communication between server and client:
The following figure illustrates the components within the server and client in CRS-IUA.

Server and client in CRS-IUA
The use cases and user experience (UX) design of CRS-IUA are largely the same as those for CRS-M. This allows the reuse of much of the backend configuration, for example, the same custom mobile form handlers are used by CRS-IUA to provide the same address and credit card functionality.
The architecture discussion in this document assumes familiarity with concepts related to Apple’s iOS, including the Objective-C language.