This service posts a message to the stock-trader-messsages channel on the ibm-cloud@slack.com server on Slack.

This service expects a JSON object in the http body, containing the following fields: id, owner, old, and new. It returns a JSON object containing the message sent (or any error message from the attempt) and the location (Slack).

There is another implementation of this service called notification-twitter, which sends the message to Twitter instead. If both implmentations of the Notification service are installed, you could use Istio routing rules to determine which gets used, and under what conditions. An example Istio route rule is in this repository (and another is in the notification-twitter repository).