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Lark OAuth

1. Create a Lark application​

On the Lark Open Platform, create an application and enable it. In the app’s basic information, note App ID and App Secret. In security settings, add the redirect URL: <your-casdoor-domain>/callback (e.g. https://door.example.com/callback).

create a new app add redirect URL

2. Create the provider in Casdoor​

Providers → Add. Set Category to OAuth, Type to Lark. Map:

CasdoorLark
Client IDApp ID
Client secretApp Secret

create a Lark OAuth provider

Username handling​

Casdoor chooses the username from Lark’s response in this order: UserId (preferred), UnionId (links users across Lark orgs), OpenId (fallback, always present). This keeps sign-in working even when some fields are missing.