Paypal dynamic subscription button ipn - paypal

Question

I am using this code I found:
<form name="_xclick" action="https://www.sandbox.paypal.com/cgi-bin/webscr method="post">
<input type="hidden" name="cmd" value="_xclick-subscriptions">
<input type="hidden" name="business" value="me#example.com">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="no_shipping" value="1">
<input type="image" src="http://www.paypal.com/en_US/i/btn/btn_subscribe_LG.gif" border="0" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
<input type="hidden" name="a3" value="5.00">
<input type="hidden" name="p3" value="1">
<input type="hidden" name="t3" value="M">
<input type="hidden" name="src" value="1">
<input type="hidden" name="sra" value="1">
</form>
When you generate a button from paypal site, it gives you the option to select the link where to send the ipn. My question is, how do I get the ipn confirmation using the code above or how do I set the link for it?

Answer 1

To add IPN notifications to this button specifically you can just add an additional hidden field to the form.
<input type="hidden" name="notify_url" value="http://www.domain.com/ipn-listener.php" />
That will only trigger an IPN for the initial transaction, though. If you want to get IPN's for all payments associated with this profile from there on you'll need to configure IPN in your PayPal account profile under the Instant Payment Notification Preferences section. Simply turn it on and set the URL you want to use.
At that point, the account profile setting will be sort of a default IPN that your account will use for all transactions. However, this can be overridden using notify_url (or NOTIFYURL in API requests.)
Hope that helps.