[Flow] Where to store API-Key

[David Sporer]

Hi,

I’m currently working on a package I thought might be worth sharing (Integration of the Newsletter2Go API).
But for the API-Calls to their API I have to provide an API Key.
If I create a plain old PHP class I’d pass the API-Key to the constructor so everyone can save their own API key in their own projects and pass them to the class.
But how would I do this in Flow?

Regards,
David