Hi MTS_Nacho, Thank you very very much for your quick response. I really appreate your help. So, even if I don't change my button, it will continue to work after the upgrade? This button worries me a bit because I received an email from PayPal earlier saying that "at least one of my buttons does not conform to the new standard". And this is the only button that does not show the new landing page directly. I also checked the html form. There is no "undefined_quantity" variable or anything like that. Is there a variable (e.g. "quanity") I can include in my form to make it 100% compliant with the new standard? Thanks again!
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