One anecdote is hardly evidence of their service being down for a week, more likely it was an issue with the merchant site or some intermediary. Having experi

One anecdote is hardly evidence of their service being down for a week, more likely it was an issue with the merchant site or some intermediary. Having experience running a service similar to PayPal's IPN, the most common problems are invalid certificate chains on the webhook URL or some other misconfiguration or blacklisting. Unfortunately webhooks are usually work most of the time that people dont think they need to implement a secondary system to check on pending transactions.