Same frustration. I needed to cancel a single subscription, and finally found a way: In my list of transactions, I found the customer's last subscription payment. Then clicked on "details" for that payment, which took me to the "Transaction Details" page. There's a link on the page, "See related [long serial no.]", which takes me to the details of the customer's subscription. On this page, there's a "Cancel Subscription" link. The above only serves for canceling a subscription, sorry to the rest of you, but I share your PayPal frustration!
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