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When the authorization_endpoint is not from the same origin, this is a cross-origin' authentication.
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Type
Redirect
A redirect to the endpoint where the authentication happens there.
Credential send on the network
The user's credentials are sent to the cross-domain on the network
The cross-origin authentication flow makes use of third-party cookies. The use of third-party cookies allows backend to perform the necessary checks to allow for secure authentication transactions across different origins. This helps to prevent phishing when creating a Single Sign-on experience.