Target Skill:
List the BillerXpert components and identify the function of each |
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How BillerXpert Works (Tier 3 and 4)

Application Server Tier
BillerXpert uses Netscape Application Server (NAS) Version 2.1, Service
Pack 3 or 4. BillerXpert gains the following features by basing its design
on NAS:
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Dynamic load balancing
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Fail-safe roll-over
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Security
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High-performance data access engine
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Connection pooling & results caching
Multi-threaded development
Netscape Application Server supports distribution of requests from many
web servers to a cluster of application servers. NAS consolidates and services
these requests by interfacing efficiently with the data repositories, such
as Oracle, Netscape Directory Server, and various external sources.
BillerXpert stencils are implemented through AppLogics, which are sets
of programming instructions that accomplish a well-defined, modular task
within the application. AppLogic objects run on NAS and are managed and
hosted by it.
The Application Server Tier includes a number of important integration
components, such Payment Services Abstraction Layer (PSAL) and the BillerXpert
Data Loading Service. This tier also includes the RealMedia Open
AdStream Server as an optional component For creating directed marketing
materials based on customer profiles, .
Data Server Tier
The Data Server tier includes two components
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Netscape Directory Server 4.0 provides a data store optimized for reading
and verifying relatively static information, such as user profile information.
Netscape Directory Server 4.0 supports the industry-standard Lightweight
Directory Access Protocol (LDAP) and certificate-based authentication and
data encryption.
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Oracle 7.3.4 provides a relational database optimized for writing client
and biller data that changes frequently, such as account balances or payment
history. Oracle supports real-time, fail-safe transaction processing and
advanced NAS features. A single Oracle user is used for all transactions
between BillerXpert and Oracle. Authentication is provided at the application
level. User access to Oracle data is provided by BillerXpert authentication,
which identifies each user and controls access to each user’s private information.
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