Attached is a customizable ASP.net 2.0/C# web form for anyone who would
like to use.
I built this because the sample provided by ACH, while very helpful, had
some scripts that did not work in Firefox.
This template allows you to customize the form in your application as
needed and then builds a clean HTTP POST stream to the SWP Payment
Gateway with the correct field-value pairs.
There is also a page to read and handle the response stream so you can
update your database with approved/declined/failed status of the
transaction.
There is a read-me file and notes in the code-behind with more
information.
I hope someone finds it helpful!
API: SWP Checkout Guide
Click link to download: swpCsharpTemplate20090226v2.zip