If your app will process data in Upsales, you'll need an API key for the account your app is running for. If this option is selected, an API key will be created and sent in the body to your app.
An administrator will have to accept the use of an API key before the app can be activated for their account.
Treat this API key with care. Since the API key is sent with each request to your app, there's no need to store this key anywhere (including logs).