Adding an authorization.bxb file seems to make OAuth based account linking the first step in the app flow. As soon as the capsule starts there is a conversation driver (button) that links to the account linking page. Only once the user completes this flow can they access the rest of the capsule.
How can you customize when the authorization flow begins. For example if your capsule contains some actions that require the user to be authorized and some initial actions that don't require your user to be authorized right away. ie: They can browse freely but if they want to save or purchase they need to link their account.
The docs for Bixby OAuth don't mention how you can customize where this flow gets invoked.