PubSUB gone wrong

Extensions
3

‘Authorization’: 'Bearer ’ + addJWT()

Looks to be the only issue, and you are getting a slightly confusing error response. As it’s parsing the Bearer/JWT and determining the ClientID from that. You should probably add an Accept header also

NodeJS Sample:

    var payload = JSON.stringify({foo: 'bar'});

        request.post({
            url: 'https://api.twitch.tv/kraken/extensions/message/' + config.twitch.streamer_id,
            headers: {
                'Accept': 'application/vnd.twitchtv.v5+json',
                'Authorization': 'Bearer ' + sig,
                'Client-ID': client_id,
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                message: payload,
                content_type: 'application/json',
                targets: ['broadcast']
            }),
            gzip: true
        }, function(e, r, b) {
~SNIP~