In situations where I have many shipments (split) for one Shopify order # some of the notifications back to Shopify will fail if purchased in batch. I believe it has something to do with sending too many requests to a single order # at a time. Normally about half the requests will fail and need retried. (Example, 3 out of 5 fail)
I would like to see some sort of throttling added in PER ORDER NUMBER, so that per order number requests trickle in and hopefully succeed the first time and there is no need to manually resend or wait for the hour retry.