It has a REST API. That should be easy.
Motivation Setup Mattermost Send a chat post via the Mattermost REST API curl example Motivation As we couldn't use Slack at work, we looked for an alternative and found Mattermost. 1. It has all features of a state of the art chat tool. 2. It has a fancy REST API. 3. We can get rid of emails as development and deployment notifications Sounds awesome. Let's start. As always with software, documentation is key....