如何实现跨移动端与桌面端的自动续费订阅及状态验证

Hey Matteo, let's tackle your cross-platform subscription challenges head-on—this is a really common scenario for apps serving both mobile and desktop users, so I’ve got some actionable solutions for you:

1. Yes, You Can Check Subscription Status & Payment History Without Mobile #

The key here is to implement a centralized backend service that acts as the single source of truth for all user subscriptions. Here’s how:

• For mobile app store subscriptions (Apple IAP/Google Play), integrate the official server-side APIs into your backend:
  • Apple: Use the App Store Server API to pull subscription statuses, renewal dates, and payment history directly from Apple’s servers.
  • Google: Use the Google Play Developer API to fetch similar details for Google Play subscriptions.
• Your backend can periodically sync subscription data (or set up webhooks where supported) to keep user statuses up-to-date. When a desktop user logs in, your desktop app just queries your backend—no need for the mobile app to be active or running.

2. Cross-Platform Auto-Renewal Management Strategy #

To avoid mismanaging access across mobile and desktop, you need a unified system that ties all subscriptions to a single user account:

• Mobile Purchases: You must use Apple IAP or Google Play Billing for mobile subscriptions (this is non-negotiable to pass app store review). But immediately after a purchase is validated, send the subscription details to your backend and link them to the user’s account.
• Desktop Purchases: Use Stripe, PayPal, or any other payment processor you prefer—desktop apps don’t have the same payment restrictions as mobile app stores. Again, sync all subscription events (renewals, cancellations, expirations) to your backend via webhooks.
• Unified Access Check: Both mobile and desktop apps should always query your backend to verify if a user has an active subscription, rather than relying on local client-side checks. This eliminates discrepancies if a user stops using mobile but keeps their subscription active.

3. Mobile WebView/Browser Redirects: What’s Allowed? #

Unfortunately, you can’t legally redirect mobile users to external web pages to purchase subscriptions with Stripe/PayPal—this violates Apple and Google’s app store guidelines for digital goods. Here’s the breakdown:

• Apple’s Rule: Apps cannot encourage users to use non-IAP payment methods for digital subscriptions or services. Redirecting to a desktop web page would fall into this category and result in rejection.
• Google’s Rule: Similar to Apple, Google prohibits directing users away from Google Play Billing for in-app purchases of digital content.
• Workaround: If you want to let users manage subscriptions (like canceling or upgrading) on desktop, you can add a "Manage Subscription" link in your mobile app that opens the desktop web portal—but this link must only lead to management actions, not new purchases. For new mobile subscriptions, you must use IAP.

Pro Tips for Smooth Implementation #

• Set Up Webhooks: For all payment providers (Apple, Google, Stripe, PayPal), configure webhooks to notify your backend immediately when subscription statuses change. This ensures your user access is updated in real-time.
• Periodic Backend Checks: Even with webhooks, periodically run a sync between your backend and payment providers to catch any missed events (e.g., a webhook failure).
• Transparent User Communication: Let users know that their subscription works across all devices, and show clear statuses (active, expiring soon, canceled) on both mobile and desktop.

内容的提问来源于stack exchange，提问作者Matteo Lomi