I have a custom .ASP shopping cart (not .NET) and I need to integrate PayPal API into the shopping cart. I will want the paypal process to proceed and confirm before the shopping cart stores the data in the database and send e-mails. All of this is already working on a couple of live carts with merchant accounts. I have just not integrated Paypal yet. The cart is designed to store a transaction ID returned by the merchant account for a successful purchase. I dont know what Paypal calls this ID but I assume it will be something similar. And you will be able to stick that in the database.
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This is called IPN and the paypal id is called transaction id and is returned as txn_id parameter. I can quickly do this for you using Classic ASP.