Android Upgrade/Downgrade Fails with DEVELOPER_ERROR on react-native-purchases v9.4.1

Hi everyone,

I'm implementing subscription upgrades and downgrades for Android in my React Native app, using react-native-purchases version 9.4.1. I'm currently running into an issue while testing on a physical device using an internal test track.

What is happening:

When I try to upgrade or downgrade from an active subscription (e.g., "plus") to another plan (e.g., "pro" or "lite"), the purchase flow fails.

• On Upgrade, I receive the following error from Google Play Billing via adb logcat:

  [RevenueCat] 🤖‼️ BillingWrapper purchases failed to update: DebugMessage: Requested replacement mode is not supported for this request. ErrorCode: DEVELOPER_ERROR.
  

• On Downgrade, I get a more generic Unknown error..

My Implementation:

I check if the user already has an active subscription, and if so, I pass a second argument to the purchasePackage call to handle the upgrade/downgrade. Here is a snippet of my code:

TypeScript

// Using "react-native-purchases": "9.4.1"
import Purchases, { 
  PurchasesPackage,
  PRORATION_MODE,
  GoogleProductChangeInfo // The type I'm currently using
} from 'react-native-purchases';
import { Platform } from 'react-native';

// ... in my purchase function
async function purchasePackage(packageToPurchase: PurchasesPackage) {
  if (Platform.OS === 'android') {
    const customerInfo = await Purchases.getCustomerInfo();
    const activeSubscriptionId = customerInfo.activeSubscriptions.length > 0
      ? customerInfo.activeSubscriptions[0]
      : null;

    if (activeSubscriptionId) { // This is an upgrade/downgrade
      const oldProductId = activeSubscriptionId.split(':')[0]; // e.g., 'dialory_subscription'

      const isUpgrade = /* ... my logic ... */;

      const productChangeInfo: GoogleProductChangeInfo = {
        oldProductIdentifier: oldProductId,
        prorationMode: isUpgrade 
          ? PRORATION_MODE.IMMEDIATE_WITH_TIME_PRORATION 
          : PRORATION_MODE.DEFERRED,
      };

      console.log('Attempting Android upgrade/downgrade with:', productChangeInfo);

      try {
        await Purchases.purchasePackage(packageToPurchase, productChangeInfo);
      } catch (e) {
        console.error('Purchase failed:', e.message);
      }
    } else {
      // New purchase logic
      await Purchases.purchasePackage(packageToPurchase);
    }
  }
}

TypeScript Compilation Error:

I'm also getting a TypeScript error, which might be related: Argument of type 'GoogleProductChangeInfo' is not assignable to parameter of type 'UpgradeInfo'. Property 'oldSKU' is missing...

This seems to suggest that for version 9.4.1, I should be using the UpgradeInfo type with an oldSKU property, instead of GoogleProductChangeInfo with oldProductIdentifier.

My Question:

1. For react-native-purchases@9.4.1, is it correct that I should be using UpgradeInfo and oldSKU for Android subscription changes?

2. Is it likely that the DEVELOPER_ERROR I'm receiving is a direct result of passing the wrong data structure (oldProductIdentifier instead of oldSKU) to the SDK?

Thanks for any help!