[rexreed]

I responded in much the same way below - your job as a sender is not to guarantee that the receiver will do its job in processing but to provide a reliable set of webhook messages so that if the receiver does fail, at least they can discover they've missed or skipped messages or are processing them out of order. As a sender, you certainly can provide guaranteed ordering or a way to identify the order of those messages. What you can't guarantee is that the receiver will process them in any given order if they choose to ignore the ordering you provide.