EPDQ ASP.NET integration

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C#

ASP.NET

e-commerce

I am currently integrating EPDQ for an E-Commerce website. The code they provide suggests that you encrypt some data on load, then save it as a session variable, finally printing it out to the page, as an input, ready to become POST data.

Next you have to POST the data to their URL, and I'm told the best way to do this in .NET is to change the Postback URL of the submit button on the checkout page to the EPQD URL. However, before I do this I want to save some of the details (address eg) to a database.

Been playing around for a while now and found no solution to this. The ideal solution would be to be able to Postback to the checkout page, allowing me to do some processing, then programmatically POST to their site.

Seems a bit mad that the only way to do this is to straight to their site, without any ability to save or process some checkout details beforehand. Any reccommendations or solutions would be great,

Thanks!