> Financial transactions often need to be processed in the order they were initiated.

And then the banks send you info in batches and out of order :) This happened to us more than once. So the team responsible wouldn't settle/cancel a payment for X even if bank said so. They would read a few other sync batches yo make sure that nothing else changed for X.

Because "Financial transactions need to be processed in the order they were initiated" is a must :)