how to check if a customer has paid through paypal
<p>Basically I have a third party shopping cart and I'm selling pdf files, the shopping cart connects to the paypal shopping cart and the customer is then able to pay with paypal, I was just wondering how is it possible that I can check if a customer has paid with paypal and then redirect the customer to download the required file,</p>

<p>I'm building a query string with the quantity, price and the name of the item from my shopping cart and pass it through to paypal, the customer is then able to login to paypal and pay for it,</p>

<p>any help would be appreciated,</p>

<p>thanks</p>
