# Proofline

> Creator and affiliate programs for iOS and Android subscription apps. Store-verified attribution, a receipt for every commission, and creator payouts. Flat pricing, no cut of your revenue.

Proofline attributes subscription purchases to creators using store-verified signals (Apple offer codes, Google Play promo codes), deterministic carries (Play Install Referrer, web checkout, universal links) and user-entered codes. It never fingerprints devices or uses the IDFA. SDKs: Swift (iOS 15+) and TypeScript/React Native. Purchase data: RevenueCat webhooks, App Store Server Notifications, Google Play RTDN.

## Quickstart

- [iOS (SwiftUI / UIKit)](https://proofline.link/docs/quickstart/ios): Install the Swift package, identify users and pass appAccountToken.
- [React Native and Expo](https://proofline.link/docs/quickstart/react-native): Install the TypeScript SDK and wire the React Native adapter.

## Concepts

- [Signals and tiers](https://proofline.link/docs/concepts/signals-and-tiers): The V/D/U ladder and how a decision is made.
- [Receipts](https://proofline.link/docs/concepts/receipts): What a receipt contains and why it replays exactly.
- [Windows and holds](https://proofline.link/docs/concepts/windows-and-holds): Click windows, renewal windows, holds and locking.

## Guides

- [Set up Apple offer codes](https://proofline.link/docs/guides/offer-codes): One custom code per creator, and the redemption link.
- [Android Install Referrer](https://proofline.link/docs/guides/android-referrer): Carry the click ID through the Play Store install.
- [Stripe web checkout](https://proofline.link/docs/guides/stripe-web-checkout): Carry the creator through Stripe Checkout with metadata.
- [Adapty (beta)](https://proofline.link/docs/guides/adapty): Send Adapty webhook events and the Proofline custom attribute.
- [Apphud (beta)](https://proofline.link/docs/guides/apphud): Send Apphud server-to-server webhooks with a secret token.
- [Superwall (beta)](https://proofline.link/docs/guides/superwall): Send Superwall subscription webhooks, verified by signature.
- [App Review and privacy label](https://proofline.link/docs/guides/app-review-privacy): What the SDK collects and how to answer Apple’s questions.

## Reference

- [REST API](https://proofline.link/docs/reference/rest-api): Authentication, idempotency, resources and errors.
- [Webhooks](https://proofline.link/docs/reference/webhooks): Events, payloads and verifying Proofline-Signature.
- [Testing and sandbox](https://proofline.link/docs/testing): Sandbox purchases, test receipts and the Integration Doctor.

## Product

- [Attribution](https://proofline.link/product/attribution): The signal ladder, receipts and coverage
- [Creator codes](https://proofline.link/product/creator-codes): Apple offer codes and Play codes, per creator
- [Smart links](https://proofline.link/product/smart-links): Links that know which in-app browser opened them
- [Creator quality](https://proofline.link/product/analytics): Retention, LTV and refunds by creator
- [Payouts](https://proofline.link/product/payouts): Holds, batches, approvals, CSV
- [Fraud protection](https://proofline.link/product/fraud): Six rules, with evidence

## Optional

- [Pricing](https://proofline.link/pricing)
- [Trust and privacy](https://proofline.link/trust)
- [Offer-code planner](https://proofline.link/tools/offer-code-planner)