One more question for you. In addition to the subscriptions and Paypal IPN we use with s2member, our customers are able to download software with their subscription.
We use a third party to protect the software. Within paypal, we can set up a button an advanced variable like this:
This automatically generates a serial number for the customer.
If we use s2member to process our payments and subcriptions we can’t use those paypal buttons. So is there a way to pass this “notify_url” along with the signup form?
(I don’t know if this your proxy keys, or some other implentation (if you have one))