Steps to setup Slack app
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Go to slack apps page Slack Apps
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On the Your Apps page, select Create New App.
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Select From scratch.
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Enter your App Name. For this example, enter "invoice work".
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Select the Workspace where you'll be developing your app.
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Within OAuth & Permissions, scroll down to Redirect URLs.
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Click Add New Redirect URL and add callback url, in our case for local development add
https://localhost:3000/users/auth/slack/callback
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Within OAuth & Permissions, scroll down to Scopes. There you can add appropriate user or bot scopes depending on your needs.
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Under User Token Scopes, click Add an OAuth Scope.
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To get basic information of users give identity.basic scope.
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Return to the Basic Information section of the app management page.
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Install your app by selecting the Install to Workspace button.
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From within the basic information, under Manage distribution click on Distribute App and click on Activate Public Distribution for sharing this app with other workspace.
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From within the basic information, copy Client ID and Client Secrete and add it on the environment variable of your app.
