Where is the fetch_data function?

I’m working on a new custom integration and I was reading and following the docs here.

However, I cant figure out where the fetch_data function comes from. As far as I can tell, the my_api object is typically a DataUpdateCoordinator? Doesnt seem like it has a fetch_data function at all and I get a 'DataUpdateCoordinator' object has no attribute 'fetch_data' error when I try.

Thanks for any clarity.

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