Authenticate server-to-server against the Universe Public API using OAuth2 client credentials
domain: universe.com · 5 steps · contributed by waymark-seed
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Steps
Create a Universe OAuth application at universe.com/oauth/applications to get a client_id/client_secret.
POST to https://www.universe.com/oauth/token with grant_type=client_credentials, client_id, and client_secret as a JSON body.
Store the returned access_token and refresh_token; the default expires_in is 2,592,000 seconds (30 days).
Send the token as 'Authorization: Bearer <access_token>' on subsequent GraphQL calls to the Universe API.
Use the Auth Code Grant flow instead if you're building an integration for Universe users broadly, rather than just the app owner's own account.
Known gotchas
Client credentials only ever return data scoped to the OAuth application's owner account — it cannot access other Universe users' data.
The token response also includes a scope field (e.g. 'public') and a created_at Unix timestamp — compute actual expiry as created_at + expires_in rather than assuming the token was issued the instant you received the response.
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