Home/ Questions/Q 794655
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-14T22:20:53+00:00

I need to create dynamic ‘Pay Now’ buttons on my site, and PayPal says

  • 0

I need to create dynamic ‘Pay Now’ buttons on my site, and PayPal says the way to do this is via an HTML FORM with preset variables for the price, currency, and item of the purchase. I use PayPal IPN to notify me when a payment has complete.

However, what’s to stop someone from modifying the query parameters of the Pay Now button to change the price? Some people have told me to redirect the button through a PHP file that sends you to a PayPal payment page with the parameters in place, but the price could just as easily be manipulated in the Web browser’s address bar. My question is, how can I deny a payment if the information I receive from PayPal’s IPN service is invalid (if the price doesn’t match our records)?

I’m quite confused and couldn’t find any documentation on what I’m looking for. Hopefully, you guys can help.

Thanks!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    I think you want to enable Encrypted Website Payments. I haven’t done this before, but you can read more here: https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&content_ID=developer/e_howto_html_encryptedwebpayments

    • 0