When I started writing Starting + Sustaining, payment processing was the most daunting topic. I felt that I had a cursory understanding of it all, but that turned out to be wrong. It is without a doubt the chapter that required the most effort to both research and write. As the longest and most involved chapter, it could be helpful to countless folks looking to launch their app. As such, I’m giving it away for anyone that could use it.
If you have any questions about payment processing, providers, merchant accounts, PCI compliance, or any of that stuff, this chapter should really help you jumpstart your learning. I hope it helps.