User Sync

Zotlo allows seamless transitions between web and mobile app experiences. Whether a user moves from web → app or app → web, Zotlo ensures that identity, payments, and subscription states stay perfectly synced.

Web → App

What is Web→App

Web→App is the flow where a user starts on your web sales site and continues the journey inside your mobile app.

This commonly occurs after onboarding funnels, quizzes, long-form landings, or pricing pages where the "Open in App" or "Install App" CTA is displayed after successful payment.

You can explore the Zotlo Quiz Funnels.

When To Use

Use Web→App when you want to:

• Convert mobile web visitors into app users

• Personalize the user journey before app install (quizzes, funnels, offer pages)

• Explain value before pushing users into the app

• Show localized or segmented offers based on country or behavior

• Capture UTM & attribution information before users move into the app

Ideal for Facebook Ads, Google Ads, TikTok Ads, Snapchat, DSP campaigns.

User Sync

When a user later installs/opens the app, Zotlo syncs all related data back into the app.

How syncing happens

• Webhooks → subscription, payment, registration, quiz response events

• API services → subscription status, payment history, customer info

• Custom parameters → subscriberId, session ID, attribution IDs (AF ID, GAID, IDFA, Adjust ID), language, country

What gets synced

• Active subscription state

• Renewals & cancellations

• Payment successes & failures

• Registration data

• Quiz answers

• Web purchases matched to the correct app user

Ads & Analytics

Zotlo can forward events to advertising and analytics platforms with 100% web tracking accuracy, including:

• Meta Ads (Pixel + CAPI)

• Google Ads (Purchase Events)

• TikTok Ads

• Google Analytics

• Google Tag Manager

This ensures Web→App conversions are correctly attributed.

🔗 Useful Documents

→ Subscription Status Webhook → Payments Webhook → Users Webhook → Quiz Responses Webhook → 3rd-party Integrations

App → Web

What is App→Web

App→Web is the flow where the user starts inside a mobile app and is redirected to a secure Zotlo web checkout to complete the purchase. This flow is fully compliant with updated App Store & Google Play rules, where applicable.

When to use

Use App→Web when you want to:

• Offer payment methods beyond IAP (Card, PayPal, Apple Pay, Google Pay)

• Reduce or avoid app store commissions

• Use a more flexible checkout

• Keep subscription logic fully external to the app

• Redirect users back to your app after payment

Great for global subscription apps or apps that want to legally bypass store fees.

Legal Status

• iOS: Legal in US, EU, South Korea, Netherlands (only dating apps), Japan (only reader apps)

• Android: Legal in all UCB-supported markets

User Sync

When redirecting to web checkout, apps can pass the necessary identifiers so the checkout immediately recognizes the user.

Identifiers to pass

• subscriberId

• Language & country

• Custom parameters (AF ID, Adjust ID, internal user ID, session token, campaign data)

How syncing happens

• Checkout Web SDK → send subscriber + custom parameters

• Personalized Checkout Link API → generate user-specific URLs

• Webhooks → real-time updates after payments

• API → verify subscription status from the app

What gets synced back

• New subscription activations

• Renewals

• Cancellations & grace transitions

• Payment failures

• Entitlements & app-side access rights

• Attribution events

Deep Link & Attribution

After a web payment, Zotlo can send the user back into your app using:

• Universal Links / Deep Links

• Attribution parameters (AppsFlyer, Adjust, Meta, Google Ads)

• Custom session identifiers

This ensures purchases made outside the app are still attributed and applied correctly.

Zotlo also pushes successful web purchases to attribution platforms: → AppsFlyer Integration → Adjust Integration

🔗 Useful Documents

→ Checkout Web SDK → Personalized Checkout Link API → Full API Reference → Webhooks Services