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Asked: 2026-05-25T16:17:59+00:00

I want to integrate Paypal in my site using Express Checkout and notify_url parameter

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I want to integrate Paypal in my site using Express Checkout and notify_url parameter which would notify my site and accordinly I can take actions.

I generated buynowbuttons. Sample buy now button is:

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
                <input name="notify_url" value='http://localhost:9000/Home/ProcessPayment' type="hidden"/>
                <input type="hidden" name="cmd" value="_xclick">
                <input type="hidden" name="business" value="something@something.com">
                <input type="hidden" name="lc" value="US">
                <input type="hidden" name="item_name" value="Basic">
                <input type="hidden" name="amount" value="24.99">
                <input type="hidden" name="currency_code" value="USD">
                <input type="hidden" name="button_subtype" value="services">
                <input type="hidden" name="no_note" value="0">
                <input type="hidden" name="tax_rate" value="0.000">
                <input type="hidden" name="shipping" value="0.00">
                <input type="hidden" name="bn" value="PP-BuyNowBF:btn_buynowCC_LG.gif:NonHostedGuest">
                <input type="image" src="https://www.sandbox.paypal.com/en_US/i/btn/btn_buynowCC_LG.gif"
                    border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
                <img alt="" border="0" src="https://www.sandbox.paypal.com/en_US/i/scr/pixel.gif"
                    width="1" height="1">
                </form>

I added <input name="notify_url" value='http://localhost:9000/Home/ProcessPayment' type="hidden"/> so it can notify my action method in my controller for debugging purpose. However, it is not working.

I get redirected to Paypal account :

https://www.sandbox.paypal.com/us/cgi-bin/webscr?cmd=_flow&SESSION=somesession&dispatch=somedispatch

But once the payment is completed it never hits my breakpoint in ProcessPayment action in Home controller. Is there something that I am missing?

Thanks in advance 🙂

UPDATE:- I had hidemyass pro account and all I had then was to setup my website in IIS and then my notify_url worked like a charm ;).

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1 Answer

  1. Editorial Team

    In usual cases your breakpoint will never be hit in this case, and that’s normal, because:

    If you don’t have a “direct” external IP-address ( and you will AT LEAST have a router ) or you have configured everything to perform correct NAT port forwarding, the PayPal IPN will go either to:

    1) Nirvana, because you have not configured the IP address correctly

    OR

    2) To your Testserver/Productionserver which IP-Adress for IPNs you actually configured.

    UPDATE:

    There are 2 Solutions:

    1. Set the PayPal IPN listener to your external address ( maybe your homerouter or your companyrouter ) and configure the NAT or ask your admin to do it

    OR

    1. Use the Remote debugger on your live/test system, to attach to the iis-process and hit the breakpoint.

    I personally would tend to solution 1., because i never got the remote debugger to work like i expected..

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