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=item MIME::Base64

Used for decoding HTTP authorization, also part of Bundle::LWP.

=item Bundle::LWP
Business::UPS, for calculating shipping, requires this. The [get-url ...]
UserTag and most payment gateways also need LWP.

=item Storable
If you have this module session save speed increases by anywhere from 25-60%.
Highly recommended for busy systems. 

=item Business::UPS
Enables lookup of shipping costs directly from www.ups.com.

=item HTML::Parser

The HTML::Entities module, which is part of this package, is used to
parse HTML entities for substitution. URI::URL and HTML::TagSet are
prerequisites.