Update gradle properties modification

Author: al-af

expo/withAppsFlyerAndroid.js

@@ -1,19 +1,25 @@
 module.exports = function withAppsFlyerAndroid(config, { 
-  shouldUsePurchaseConnector = false 
-} = {}) {
+    shouldUsePurchaseConnector = false 
+  } = {}) {
 
-  if (shouldUsePurchaseConnector) {
-    if (!config.android) {
-      config.android = {};
-    }
-    
-    if (!config.android.gradleProperties) {
-      config.android.gradleProperties = {};
+    if (shouldUsePurchaseConnector) {
+      if (!config.android) {
+        config.android = {};
+      }
+  
+      if (!config.android.gradleProperties) {
+        config.android.gradleProperties = [];
+      }
+  
+      // Prevent duplicates
+      const existingKeys = config.android.gradleProperties.map(p => p.key);
+      if (!existingKeys.includes('appsflyer.enable_purchase_connector')) {
+        config.android.gradleProperties.push({
+          key: 'appsflyer.enable_purchase_connector',
+          value: 'true',
+        });
+      }
     }
-    
-    // Enable AppsFlyer Purchase Connector for Android
-    config.android.gradleProperties['appsflyer.enable_purchase_connector'] = 'true';
-  }
 
   return config;
 };