I'm looking for your experience with web API integrations and the problems you encountered because of it.
Perhaps this forum is more focussed on developing web services, but I can give it a shot.
For my thesis project I am investigating problems that occur in production applications due to errors returned by a web service or web API.
In my experience it is difficult to test an API integration and effectively monitor the interaction to understand what is going on.
By understand what type of problems occur in web API integrations and why they happen I hope to advice API designers how to help API users prevent, detect and handle API errors more effectively to reduce the impact of these errors.