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Point your Firebase Apple SDK at Lark by passing your Lark URL to Database.database(url:). Everything else (observers, writes, queries) works without changes.

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Setup

Add Firebase Realtime Database via Swift Package Manager or CocoaPods: 
// In Xcode: File > Add Package Dependencies
// Enter: https://github.com/firebase/firebase-ios-sdk
// Select "FirebaseDatabase"

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Connect to Lark

Pass your Lark URL when getting the database instance: 
import FirebaseDatabase

// Change this from https://PROJECT_ID.firebaseio.com
let database = Database.database(url: "https://your-lark-project-id.larkdb.net")
let ref = database.reference()
If your GoogleService-Info.plist already has the DATABASE_URL field, you can update it there instead and use Database.database() without arguments.

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Database routing

If your Firebase app stores many independent data silos under path prefixes (game rooms, workspaces, etc.), see Database routing for options on splitting them into separate Lark databases.