About the instructions, I'm pretty sure there isn't much you need to do after you configure s2Member with PayPal's account details, I understand from that documentation that s2Member takes care of it for you when it parses the shortcode for the button/form.
Why don't you try having your settings over at PayPal default to what your cart needs, and configure your s2Member settings for PayPal to work with them, generate a button and try a test purchase, you can make it a tiny amount for live purchases, or use PayPal's Sandbox for test purchases (no payment will happen). See if the custom IPN/PDT URLs work for them as configured in s2Member instead of PayPal.Statistics: Posted by Cristián Lávaque — May 31st, 2011, 3:11 pm
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