I have site which sell items. Site has shopping cart developed by me in ASP.NET 2.0 which is working fine with PayPal and all the payments are verified with IPN (Instant payment notification) now.

I want to use 2checkout as well. But problem is there is very less documentation (example or tutorials) that help me integrate 2checkout. Now what I want is

Once items added to cart and user submit checkout button the Order number is generated. Now I want to send customer to 2checkout site with that order number and description of whole so that when customer reach the 2checout he should know his order number, total amount and little description he is paying for.

Is there any document or anything that show me how to send info to 2checkout once order is submitted on our site?

Onemore thing, Is there any notification system generated by 2checkout once payment successful which is posted back to site where he shopped from to save in database like IPN in paypal?

Thanks I am waiting for the reply