I'll get search working at some point. It looks like simplenote doesn't have an API, but there's just a native copy button that'll copy both your notes and the reference sections, to your clipboard.
It's what all the 3rd party SimpleNote apps use. However, they stopped accepting applications for the SimpleNote API key. Compare documentation from [2018] and [now].
You can still find the API key in the source code of other projects like [1].
I think the same API was given out to all 3rd party apps. (Or all the open source apps copied the same original key.)
I'll get search working at some point. It looks like simplenote doesn't have an API, but there's just a native copy button that'll copy both your notes and the reference sections, to your clipboard.