I’m not though. I keep getting 400 and 401 errors.
With request as POST:
https://api.twitch.tv/kraken/channels/{channel}/commercial
with data:
length=30
with headers
Content-Type: application/x-www-form-urlencoded
Accept: application/vnd.twitchtv.v3+json
Client-ID: {client-id}
Authorization: OAuth {token}
I would test it further, but there’s no way to test the API’s partner features without partnered accounts.