Is wrong, you are adding “channel” to the end of “clientsecret”
“url” is appended to “baseUrl”
You’ve messed up how request works.
request({
url: 'https://id.twitch.tv/oauth2/token' +
'?grant_type=refresh_token' +
'&refresh_token=' + refreshtoken +
'&client_id=' + clientID +
'&client_secret=' + clientSecret,
method: 'POST',
json: true
},
And as a side note, request is deprecated, you should consider moving off request to a newer library