Assuming buyer is required, the following 2 results were found.
such as eBay or PayPal. You get an email that claims to be from «CompanyName», eBay, PayPal or another company and offers buyer protection or an online payment system. This could be directly in connection with a transaction through someone you’ve met...
This is an article to document how I got a client's eBay to notify the seller every time a buyer bought a fixed price item. This uses the Trading API even though I'm aiming for the Platform Notifications API... Why? A follow on from my article Zoho...