I think you’re referring to Tips rather than donations, and no, there is no API endpoint that would allow you to do that because you Twitch doesn’t provide any services for tipping a streamer.
Even most 3rd party services that offer functionality for tipping a streamer would not let you do the sort of thing you want to do as it can easily be abused, so most (if not all) services for tipping a streamer require direct user interaction rather than an API endpoint.