I'm building an events system where users can book & pay for tickets - I'm intending to use Sage Pay Form, and have all transaction data held on their servers (I would collect ticket order, customer name & address on the website, then have them POST it to Sage Pay).
The only information I need 'my end' is confirmation that payment has been received, so I can simply mark a ticket as sold (most events will have limited tickets).
I've worked with PayPal IPN (& PDT) before, and wondered if Sage Pay offers a similar notification service?