Any assistance in clarifying the following use case will be highly appreciated:
Considering a scenario where an AEM platform is integrated with one or many external integrations. As part of a new requirement, some changes are done on the author. So how do you ensure all the existing integrations on the live site are working as expected when the new changes are published from Author.
As part of a new requirement -When a new requirement comes, make sure to do enough requirement gathering and analysis to make sure which all modules need the changes. Once you analyse this, it will be easy for you to understand , which all integrations are present for that module and if that will be affected at all.
Most importantly, make sure to do a POC if the requirement is something really new and you are not sure how this is going to affect any other integrated systems.
As kautuksahni said, it is difficult to help you more on this vaguely. Above said was my suggestion and approach I may take when I face any such situation