slack incoming webhook - send message to another channel

Question

I am trying to post message to any channel in a slack team.

My webhook has been properly created and installed into my test team. As part of the install process, I s

Answer 1

The app needs the chat:write:bot permission to post messages to other channels.

The permission can be added in Manage Apps → your app → OAuth & Permissions:

Reading Slack's own documentation, this was not obvious to me. (although it is mentioned under "Using the Web API" in the Intro to Messaging.)