I ran in to a challenging situation the other day.
I recently helped fast-lane an ecommerce site for a small book store, and the traffic has been booming. Where I expected a few dozen orders out-of-the-gate, and to slowly correct any issues, it blew everyone’s expectations away, taking in hundreds of orders the first week. They’ve seen over 2k orders (that’s individual orders, not dollars) in less than a month. Awesome for the bookshop! Not so awesome for the over-whelmed dev :x
Initially, Paypal was the only payment gateway, and Paypal sends confirmation emails when orders are placed.
No news is good news, right? Wrong.
We integrated another payment gateway, only to realize Magento wasn’t automatically sending out order confirmation emails… All of the prior order confirmation emails had been sent by Paypal. And Magento hadn’t sent squat! Ruh-roh.