What must you first obtain and then add to your OAuth flow(once the authorization expires)?

The correct answer is"Refresh token."When implementing OAuth authentication,obtaining and utilizing refresh tokens is a crucial aspect of maintaining continuous access to resources.Refresh tokens are long-lived credentials that are exchanged for new access tokens once the latter expire.Unlike access tokens,refresh tokens typically have a longer lifespan and can be used to obtain new access tokens without requiring the user tore-authenticate.This mechanism enhances security by minimizing the exposure of access tokens,as they are short-lived and are less susceptible to misuse if compromised.Additionally, using refresh tokens facilitates a smoother user experience,as it allows applications to seamlessly obtain new access tokens without requiring user intervention,ensuring uninterrupted access to the integrated services.Therefore,incorporating refresh tokens into the OAuth flow is essential for ensuring the longevity and security of the authentication process in applications integrating with platforms like Hub Spot.