Using PayPal's IPN feature to prevent changing price

[cunning-fox]

Hi,

I'm using PayPal. I want to eliminate people from being able to change the price of my downloadable product. I need a serverside page that can take advantage of PayPal's IPN feature to prevent price changing. Can anyone make a script that can do this?

https://paypal.com/html/ipn.pdf

Thanks

[Nightfire]

They shouldn't be able to change the price, unless your host has no security what so ever.

[brothercake]

They could read the webscr info out of your source code, recreate the exact same form on another page but with a different price, and then POST that to PayPal.

It would probably work, but it's unlikely compared with the complexity of what you want to set up. For instance - do you have SSL on your server - that IPN technique won't work in non-encrypted environment.

What's your product? If it's a physical product or anything else where you directly control delivery then you can simply not supply to people who fake the price.

Have a look at the Paypal Developer Network - they may have some easier answers to your dilemma.