[in_app_purchase] Update Play Billing library to 7.1.1 (#8218)

Updates Play Billing Library to the latest version 7.1.1. Exposes new APIs as per [release notes](https://developer.android.com/google/play/billing/release-notes):
- Adds Dart representation of `ProductDetails.InstallmentPlanDetails`
- Adds Dart representation of `PendingPurchasesParams` and removes the deprecated `enablePendingPurchases` method on `BillingClientWrapper` (breaking change)
- Adds Dart representation of `Purchase.PendingPurchaseUpdate`
- Removes the deprecated `ProrationMode` as it has been removed from the native library (breaking change)

This PR introduces breaking changes in `in_app_purchase_android`, but does not introduce any breaking changes on the platform interface level.

Fixes flutter/flutter#147394

Author: mchudy

packages/in_app_purchase/in_app_purchase_android/CHANGELOG.md

@@ -1,3 +1,14 @@
+## 0.4.0
+
+* Updates Google Play Billing Library from 6.2.0 to 7.1.1.
+* **BREAKING CHANGES**:
+  * Removes the deprecated `ProrationMode` enum. `ReplacementMode` should be used instead.
+  * Removes the deprecated `BillingClientWrapper.enablePendingPurchases` method.
+  * Removes JSON serialization from Dart wrapper classes.
+  * Removes `subscriptionsOnVR` and `inAppItemsOnVR` from `BillingClientFeature`.
+* Adds `installmentPlanDetails` to `SubscriptionOfferDetailsWrapper`.
+* Adds APIs to support pending transactions for subscription prepaid plans (`PendingPurchasesParams`).
+
 ## 0.3.6+13
 
 * Updates androidx.annotation:annotation to 1.9.1.

packages/in_app_purchase/in_app_purchase_android/android/build.gradle

@@ -31,7 +31,7 @@ android {
     compileSdk 34
 
     defaultConfig {
-        minSdk 19
+        minSdk 21
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     lintOptions {
@@ -60,7 +60,7 @@ android {
 
 dependencies {
     implementation 'androidx.annotation:annotation:1.9.1'
-    implementation 'com.android.billingclient:billing:6.2.0'
+    implementation 'com.android.billingclient:billing:7.1.1'
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.json:json:20250107'
     testImplementation 'org.mockito:mockito-core:5.4.0'

packages/in_app_purchase/in_app_purchase_android/android/src/main/java/io/flutter/plugins/inapppurchase/BillingClientFactory.java

@@ -19,10 +19,13 @@ interface BillingClientFactory {
    * @param callbackApi The callback API to be used by the {@link BillingClient}.
    * @param billingChoiceMode Enables the ability to offer alternative billing or Google Play
    *     billing.
+   * @param pendingPurchasesParams Parameters to enable pending purchases. See {@link
+   *     com.android.billingclient.api.PendingPurchasesParams}.
    * @return The {@link BillingClient} object that is created.
    */
   BillingClient createBillingClient(
       @NonNull Context context,
       @NonNull Messages.InAppPurchaseCallbackApi callbackApi,
-      PlatformBillingChoiceMode billingChoiceMode);
+      PlatformBillingChoiceMode billingChoiceMode,
+      Messages.PlatformPendingPurchasesParams pendingPurchasesParams);
 }

packages/in_app_purchase/in_app_purchase_android/android/src/main/java/io/flutter/plugins/inapppurchase/BillingClientFactoryImpl.java

@@ -5,6 +5,7 @@
 package io.flutter.plugins.inapppurchase;
 
 import static io.flutter.plugins.inapppurchase.Translator.fromUserChoiceDetails;
+import static io.flutter.plugins.inapppurchase.Translator.toPendingPurchasesParams;
 
 import android.content.Context;
 import androidx.annotation.NonNull;
@@ -21,8 +22,11 @@ final class BillingClientFactoryImpl implements BillingClientFactory {
   public BillingClient createBillingClient(
       @NonNull Context context,
       @NonNull Messages.InAppPurchaseCallbackApi callbackApi,
-      PlatformBillingChoiceMode billingChoiceMode) {
-    BillingClient.Builder builder = BillingClient.newBuilder(context).enablePendingPurchases();
+      PlatformBillingChoiceMode billingChoiceMode,
+      Messages.PlatformPendingPurchasesParams pendingPurchasesParams) {
+    BillingClient.Builder builder =
+        BillingClient.newBuilder(context)
+            .enablePendingPurchases(toPendingPurchasesParams(pendingPurchasesParams));
     switch (billingChoiceMode) {
       case ALTERNATIVE_BILLING_ONLY:
         // https://developer.android.com/google/play/billing/alternative/alternative-billing-without-user-choice-in-app