One app per integration. Each has its own keys and its own webhook endpoint, so a storefront and a billing job never share a secret.
Each app gets one key when you create it, and that key never changes when you go live. The app starts in test mode; press Go live once you're verified, and your code keeps running untouched.
It starts in test mode, and its key is shown once, here, as soon as it's made.
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