React Native purchase verification

// Install your IAP library of choice
npm install react-native-iap

// After purchase with react-native-iap
const purchase = await RNIap.requestSubscription({
  sku: 'pro_monthly'
});

// Send token to your backend for verification
await fetch('https://your-api.com/verify', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    platform: Platform.OS,
    purchaseToken: purchase.transactionReceipt,
    productId: 'pro_monthly',
    packageName: 'com.yourapp'
  })
});

// Your backend (Node.js example)
const res = await fetch(
  'https://tierux.com/api/v1/purchases/google-play/verify', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    appId: 'app_123',
    userId,
    packageName: 'com.yourapp',
    productId: 'pro_monthly',
    purchaseToken
  })
});

// Your backend response
res.json({ active: true, entitlement: 'pro', expiresAt });

// In your React Native app
if (result.active) {
  unlockProFeatures();
}