How do mortgage companie know a residency is a “Primary”?

[Ramiro Rodriguez]

Looking to buy a property im Preaprroved for an FHA 3.5% down. But they say I must live in the residence for 1 year. My plan was to do a light rehab of the interior within the first few months of owning it and use it as an AirBNB rental after that.

How do they “confirm” it is my primary residence?

Do they show up at your door to check if you live there?

What is the process for this?

Thanks!