Paypal Express checkout Integration

Hi, I have a website in classic ASP and i already have a regular checkout, but i want to integrate PayPal express checkout in my website. I have already managed to include the PayPal button and link the users to PayPal website and make them log in and then inside they have a Pay now button, then they click that button they are somehow redirected from paypal to my website checkout and the url comes with a token value and a player ID. I have instructions from paypal that i need to run a file to clear the payment but until now i couldn´t do the ASP code to charge the client and give me a successful payment. TWO VERY IMPORTANT THINGS 1. you bid only if you have done this express checkout linking before 2. you bid as low as possible. the lowest bidder with experience will win this job thanks to all