Manage credentials
It is likely that you will need to provide a set of test credentials to fully test your package.
In that case you can use httr2 which offers substantial support for secret management.
Then you can add your key to your user-level .Renviron file.
YOURPACKAGE_KEY=key_you_generated_with_secret_make_key
Now you can restart R
You also can add your key to your workflows.