Stripe’s annual letter has arrived, the moment when we get a quick peek at what’s going on at Ireland’s most successful start-up.  The main thing we learned was that transaction volume grew to $817 billion. Transaction volume is the most top-line of top-line numbers. It’s the value of payments handled by Stripe before merchants or credit cards get their cut. Two things are notable about Stripe’s transaction volume. First is the trajectory. In 2021, the year of a pandemic-induced e-commerce boom, volumes grew by 60 per cent. At the time, Stripe cautioned that growth was sure to slow in 2022,…