How to Decouple Your APIs

There is usually this missing part, which is how do you connect to this API? Where is this broker located? What are the topics or channels? And for each channel or topic, what's the messages that I can publish here? Because maybe you allow more than one message on each topic. You have one off, right? Or any off or something like this. So yeah, there are these kind of things that usually for API governance or management, right? That also happens to apply to messaging.