On my website im displaying different products each with different prices,of course i cant make different buy now buttons for each product with the price.I want to create one buy now button for all products and then by some way sending price of each product.How can i send this price info to paypal ?

And second question is,when user go to paypal and make the payment and buy the product,how can i get the confirmation in my code that user did make the payment.I want to show a msg when user make the payment and other msg when client doesn't complete the payment process in paypal.Tht i can do when i receive some notification back from paypal when user will click on buy now button and complete the payment process.