1. While logged in to Slack, open https://api.slack.com/apps/.
Press the "Create New App" button in the upper right corner.
2. Select "From scratch."
3. Enter any application name and select the name of the workspace to be linked.
4. You have created a Slack application. Next, create a Webhook URL. Select Incoming Webhooks from Features on the left.
5. Click the switch to enable the Webhook URL.
6. Scroll down the screen and you will see a section called Webhook URL. Press the "Add New Webhook to Worksace" button.
7. Select the channels to be linked and allow.
8. A Webhook URL has been created.