I made sure I set the options properly for my subscription page. Here's a screen shot: http://dl.dropbox.com/u/6772570/error.jpg
I wanted to test it in sandbox mode.
(TEST PAGE URL: http://downloads.nbastuffer.com/test-subscription/ )
Here's what happens:
1) I land to PayPal Sandbox checkout page successfully,
2) When I login to my sandbox buyer test account, an error page comes that reads: "The link you have used to enter the PayPal system is invalid. Please review the link and try again.",
3) On my live page, I created a manual subscription button by using PayPal's guide. And it works without a problem. URL: http://downloads.nbastuffer.com/download-nba-box-score-stats-in-excel/current-season/
4)I clearly want to use eStore's own subscription functionality, because I want my subscribers to land to a different landing page after subsription process. So please help.