No, you require permission from the broadcaster to read redemptions.
And you’d need a ClientID (and App Access token) to even read public data.
Which Redemptions/Channel Points is not (public data)
As this is “priviledged” data.
Provider a way for the streamer to login/provider access then, even if that is implicit auth.
EventSub is your best optionb for this, which currently only offers a WebHook Transport.
And will require a server and prior authentication/authorisation from the streamer wishing to use this tool