Fires immediately before the authentication cookie is set.
Parameters
$auth_cookiestring- Authentication cookie value.
$expireint- The time the login grace period expires as a UNIX timestamp.
Default is 12 hours past the cookie’s expiration time. $expirationint- The time when the authentication cookie expires as a UNIX timestamp.
Default is 14 days from now. $user_idint- User ID.
$schemestring- Authentication scheme. Values include
'auth'or'secure_auth'. $tokenstring- User’s session token to use for this cookie.
Source
do_action( 'set_auth_cookie', $auth_cookie, $expire, $expiration, $user_id, $scheme, $token );
Example: