1st of all I don't know why my post ended up in the Sandbox Environment group, I had selected another group. Anyway... In my web application I'm using a custom button that when clicked redirects to: https://www.sandbox.paypal.com/cgi-bin/webscr for testing purposes or https://www.paypal.com/cgi-bin/webscr in production The following parameters are added to the query url: cmd="_xclick" button_subtype="services" no_note="1" no_shipping="1" return=pp_return rm="2" cancel_return=pag_cancel I removed parameters non relevant to this post. With rm set to 2 I don't get any call to pp_return (I know it's a POST not a GET) but there's no redirect to pp_return either (it is a variable with the url of the return page on my site). After the payment I have to click on the button "Back to the original site". I used the HTML variables documented here: https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/# I suppose one of the parameters is not the right one...
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