From my limited exposure, it seems to me that most shopping cart/eCommerce platforms are specifically for products-based retailers. On several occasions now, I've been asked about ecommerce solutions for service providers. That is, it's basically just a single product with payment but no shipping, and highly configurable "product".

Any recommendations for a cost-efficient solution (high feature coverage) for such a web platform? Requirements:

• .NET
• No/suppressed product catalog
• A service customization selection form
• Payment (probably PayPal with accountless credit card processing)
• Guest purchases (no site account required)
• Email confirmation
• Customer service -facing control panel

It's hard to search for such a product because I get "web service based ecommerce software" and so on clouding up the results.