First, you'll need to get a Meetup Client ID. Follow these steps:
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Visit https://www.meetup.com/api/oauth/list/ and sign in.
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Click "Create new client".
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Set the "Client name" to the name of your application.
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Set the "Application Website" to your site URL.
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Set the Redirect URI to: {{siteUrl}} (Do not append a path to this URL.)
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Fill out all the other required fields.
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Click "Create" and note down your "Key" (Client ID) and "Secret" (Client Secret).