You need to create the bot in Slack to receive notifications.
To do so follow the steps:
1/ Go to manage apps in Slack
2/ Create new app
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fd99c91e8-866f-4385-8d0b-ffa26bcc2b36%2FScreenshot_2022-12-07_at_10.09.21.png?table=block&id=4e02c03c-8e56-495a-a3a1-c3b8ece4e342&cache=v2)
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Fcec02393-5ccd-4ab0-a54d-14866b589da0%2FScreenshot_2022-12-07_at_10.10.04.png?table=block&id=93983fa3-7716-45d7-929f-9adc691198d1&cache=v2)
3/ Add incoming webhooks
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F96a61521-e240-4e0b-bba3-161dcaf38009%2FScreenshot_2022-11-23_at_17.10.37.png?table=block&id=73b1210d-dcd0-4caf-8149-16922e488516&cache=v2)
4/ Select a channel where to post
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F32c9c0af-58d7-453b-a419-660c3994e685%2FScreenshot_2022-11-23_at_17.11.25.png?table=block&id=a7cc9cc6-183c-4985-930b-97bd43c1bc4d&cache=v2)
5/ Copy the webhook
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2Feb9ccdbb-3500-4d8c-874b-f5f39fc84b0a%2FScreenshot_2022-12-07_at_10.13.52.png?table=block&id=0b2e676d-df90-4d05-bc0b-ab88a4fb537b&cache=v2)
6/ Add your webhook in the pipeline deployment settings
![notion image](https://www.notion.so/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F832699cf-7713-47c7-972b-3e45f747abb5%2FScreenshot_2023-05-01_at_17.42.14.png?table=block&id=486458ba-7a07-422a-84ec-ba68326e788a&cache=v2)
You are all set!