Btw I ran the code with the channel name as channel in the body and I got this:

data: {
      id: 'err_20240328095512x134ABA66',
      code: 400,
      type: 'ReferenceNotFound',
      message: `The channel named "channel" doesn't exist for the integration "6d68151a-186e-49c6-a128-940f9a60e673"`
    }