I need to determine when a user's paypal subscription is set to end/renew. I know that the easiest way to do this would be to extrapolate it from the time when the initial subscr_signup gets sent through, based on the subscription interval value, but because I'm working with some 3rd party software, it's not possible (or at least, not ideal).
It seems to me that I ought to be able to send a query to paypal to get this info based on txn_id, but I can't find any documentation that implies that this is the case. Can anyone give me a definite answer?