How to convert a LatLng object (Current Device Location) into a string for API calls

I need to use the device location and make a call to my API with it, but since "device location" is a LatLng object, I am unable to do so because all the types that I can use for the variables in my API call doesn't include "LatLng" objects. How can I convert the device location global property into a string that I can pass into my API?

Thanks 😄