Most write-ups about Checkout. com focus on the valuation swings. What's more useful if you actually build software is the architectural decision sitting underneath the business: bundling gateway, acquirer, and processor into one API instead of making merchants stitch together five vendors.
Source: [Dev.to](https://dev.to/epplusuk/the-architecture-behind-a-12b-payments-api-what-checkoutcom-teaches-developers-about-building-2l54)