Need advice to implement shopping/payment systems

[damon2003]

Hi,
I am a web developer, quite competent with ASP, SQL, Dreamweaver, but I need some info about implementing payment systems within web sites.

I want to know what is the best way to sell products online from a catalogue of products stored in a database.

I have used PayPal before, but this is too simplistic for what I want. I have also used worldPay briefly. The way I did it was to have a button with the payment info attached to it, it then takes the user to worldPays own secure server. But this is not really suitable either. It doesnt look like part of the site I build. The design and so on is completely different. Is it actually possible to integrate worldPay into a site so it is more integrated, like for example how amazon's site is done?

This is the sort of thing I really need, an amazon like payment system, one that is truly integrated into a site. What is the best way to do this.
Would this sort of payment system involves setting up custom links with credit card companies? I have also heard MTS used in the context of payment systems, whats this?

Any advice here is much appreciated,
thanks a lot

[Compguy Pete]

I'm guessing in the context of how your using MTS your talking about Microsoft Transaction Server I have a link below.

http://www.microsoft.com/com/tech/mts.asp

For accepting payments from any Credit card I've always used http://www.authorizenet.com/. Most any prebuilt cart will accept Authorize.net as it's payment gateway.

[damon2003]

Thanks,
Can you recommend any good shopping cart software that can be used with autherize.net. Is there any free shopping cart software available. If not what sort of money does it cost?
I already have a website (ASP) build with a database containing products and also have searches implemented. I want to 'bolt on' a payment facility to this site. Whats the best way to achieve this?
thanks a lot

[Compguy Pete]

Here is the cart I use... it might work for you...

http://www.agoracart.com/