[tasn]

The problem with "n+1 after HTTP request for webhooks n completes" is that your throughput is very adversely impacted by this. Let's assume that a webhook takes 1s to process (usually much slower when you include network latency, and endpoint processing time), you're effectively limited to 1 request per second.

Counter makes it slightly better because then you can reconstruct the order without the above artificial limit, though it's also not great (though indeed much better!).