Install Attribution

WarpLink uses two tiers of attribution matching to connect app installs to the links that drove them.

Match Cascade

When the app opens, the SDK collects device signals and sends them to the WarpLink API. The server compares them against stored click signals.

Deterministic Matching (IDFV)

Used for re-engagement — when the app was previously installed on the same device.

• Signal: UIDevice.current.identifierForVendor (IDFV)
• Match type: .deterministic
• Confidence: always 1.0
• Does not require ATT permission

IDFV is a UUID unique to the combination of your app and the device. It persists across reinstalls on the same device.

Probabilistic Matching (Enriched Fingerprint)

Used for first-install attribution — when the app was not previously installed.

• Signals: IP address + User-Agent + Accept-Language + screen size + timezone
• Match type: .probabilistic
• Confidence: varies by time window

Interpreting Results

The WarpLinkDeepLink includes matchType and matchConfidence:

WarpLink.checkDeferredDeepLink { result in
    if case .success(let deepLink) = result, let deepLink = deepLink {
        let confidence = deepLink.matchConfidence ?? 0

        switch confidence {
        case 0.5...:
            navigateTo(deepLink.destination)
        case 0.3..<0.5:
            showSuggestion(deepLink.destination)
        default:
            showOnboarding()
        }
    }
}

App Tracking Transparency

The WarpLink SDK:

• Does not use IDFA (Advertising Identifier)
• Does not prompt for ATT permission
• Uses only IDFV, which is exempt from ATT
• Does not interfere with your app's own ATT strategy

Privacy

Signals Collected

Not Collected

• IDFA (Advertising Identifier)
• Location data
• Contacts or personal data
• App usage data
• Cross-app identifiers

All signals are sent over HTTPS and used solely for attribution matching. No cross-app tracking is performed.