ipn.txt

#   subscr_eot:     When a subscription has been cancelled you'll get this
#                   after the paid up term is finished. If the subscription is
#                   cancelled because the client can't pay on the renewal date
#                   (perhaps their credit card has expired, or their funding
#                   source is somehow removed) then you'll get this straight
#                   away.
#
#   subscr_cancel:  When a client cancels their subscription you'll imediately
#                   receive a subscr_cancel IPN. The paid-for term hasn't ended
#                   yet though (that's a subscr_eot), so don't cancel their
#                   services immediately.
#
#   subscr_signup:  When a client follows the subscription link and completes
#                   the signup you'll receive this. TODO: Find out if this
#                   includes the first payment.
#
#   subscr_payment: When it's renewal time and the funds have been moved to
#                   your account you'll get one of these.
#
#   subscr_failed:  It's renewal time but PayPal couldn't retrieve funds from
#                   the payment source that the client signed up with. This
#                   might be a good time to email them and ask them to fix it.
#
#   web_accept:     When a client clicks on the "Pay Now" link or button and
#                   completes payment you'll get one of these.
#
#   send_money:     When someone emails money you'll get one of these.
#