Introspects the access token to refresh token.

An opaque token is validated using the this endpoint by passing the access token or refresh token via the token body parameter and returns a boolean that indicates whether it is active. If the token is active, additional data about the token is also returned. If the token is invalid, expired, or revoked, it is considered inactive. Refer complete guide here. See the OAuth2 spec https://oauth.net/2/

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