How do I know when an API is getting triggered ?

Certified Associate Developer

This might sound a bit silly but I wanted to know how to track during which phase of the application flow, an API is being triggered?

I have an API that kick starts a process model that queries data from database and that is about it. In the backend I see this process model is getting triggered every now and then started by a service account. Now, how do I know when this API is even being called? How do I back track it? checking its dependents doesn't show anything except for the process model. 

Any response is appreciated. Thanks.  

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