ClickEnable Interactive Messages, enter Request URL and click Enable Interactive Messages The Request URL must be publicly accessible and secure.
Click theBot users link in the menu.
ClickAdd a Bot User, enter Display name and Default username and click Add a Bot User
Click theOAuth & Permissions link in the menu.
Go to Redirect URLs section click Add a new Redirect URL, enter Redirect URLand click save changes. The Redirect URL must be publicly accessible and secure.
Go to scopes section and select “Administer the workspace” scope and click save changes.
Click on theInstall App to Team button found on the Install App If new permission scopes or Slack app features are added after an app has been installed, app has to be reinstalled to workspace for changes to take effect.
Once the app installed, the access token will be generated in OAuth & Permissions page