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    <p>If the ID you refer to is a unique reference that you use, then pass this back and forth between Paypal and your site using the <code>item_number</code> element.</p> <p>Set the ID in the HTML form you show to your customer and note you can also specify 3 URLs:</p> <pre><code>&lt;input type="hidden" name="item_name" value="Box of stuff"&gt;&lt;/input&gt; &lt;input type="hidden" name="item_number" value="12345"&gt;&lt;/input&gt; &lt;input type="hidden" name="return" value="http://www.blah.com/paypal_thanks.asp"&gt;&lt;/input&gt; &lt;input type="hidden" name="notify_url" value="http://www.blah.com/paypal_callback.asp"&gt;&lt;/input&gt; &lt;input type="hidden" name="cancel_return" value="http://www.blah.com/paypal_cancel.asp"&gt;&lt;/input&gt; </code></pre> <p>Where I have used "paypal_callback.asp" above, this overrides the IPN link which you can set up when you log into Paypal and edit your settings. So this value is optional.</p> <p>The scrpt paypal_callback.asp (assuming written in ASP) can then just say: </p> <pre><code>iAdvertId = Request.Form("item_number") </code></pre> <p>Note that this page is not the one shown to the user! It is hit by Paypals servers behind the scenes. The annoying thing is that paypal_callback.asp will not get called by Paypal immediately. It might be 3 days later...or they might hit it a month later to retract a payment.</p> <p>The customer will get redirected to either paypal_thanks.asp or paypal_cancel.asp in my example. These pages will not be passed a form or querystring, so the only way to get hold of the number you places in <code>item_number</code> is to also store it in a cookie BEFORE the user submits the form to purchase.</p> <p>When you get the email from Paypal, the <code>item_number</code> will be mentioned in the subject line, and within the mail body too (on the end of the Description line).</p> <p>It is also possible to set additional information in custom fields. The <a href="https://cms.paypal.com/us/cgi-bin/?&amp;cmd=_render-content&amp;content_ID=developer/e_howto_admin_IPNIntro" rel="nofollow noreferrer">Paypal documentation</a> details how to do this, and you can test it with their IPN simulator in the <a href="https://www.sandbox.paypal.com/" rel="nofollow noreferrer">sandbox</a>.</p>
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    1. POPaypal + PHP: how to receive a value on success sale
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    1. USMagnus Smith
    1. USMagnus Smith
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    1. COand what if i need 2 variables to be sent?
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    2. COi tested the whole thing but i have a problem. once the transfer is successful, it redirects me back to domain.com/buy?merchant_return_link=blabla instead of the link that is set in the button as a successful return point. why?
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    3. COi'll edit my post to try and answer your questions
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