title: Incorporating paypal into my PHP shopping cart?
body: <p>I'm building a simple shopping cart using PHP and I want to be able to use paypal with it. I want to use the tools described here: 
  <a href="https://www.paypal.com/cgi-bin/webscr?cmd=p/pdn/howto_checkout-outside" rel="nofollow">https://www.paypal.com/cgi-bin/webscr?cmd=p/pdn/howto_checkout-outside</a></p>
  
  <p>This seems to be the easiest way to go about doing this. I looked over at their development page, and was really confused, but this made sense. My only problem is with this I have been told that it's fairly easy to change the prices. Now I could run a script to check the return from paypal to check to see if their order price matches their cart total, but I want to stop this before it happens. The one thing I did take from the development site was their token call. Would I be able to build a function that creates the buy now button by providing all the items through the method above, and then making a token call to link the id of those items and prices to the button? I'm just a bit confused, a lot of people have said to look at the documentation, but I'm having a difficult time understanding all of it so any help is really appreciated. </p>