The only thing to take with you is that you need automatic regression tests against 3rd party APIs. That way when they change their behaviour or goes down you a

The only thing to take with you is that you need automatic regression tests against 3rd party APIs. That way when they change their behaviour or goes down you are alerted straight away. Hopefully those test suites would be running against 3rd parties staging/development environment as well so you are alerted sooner about feature changes.