chore: load Subtester API keys from a gitignored local file

Subtester/.gitignore

@@ -36,4 +36,8 @@ sysinfo.txt
 *.unitypackage
 
 iOS/
-.vscode/
+.vscode/
+
+# Local RevenueCat API keys (copy local-api-keys.example.json to Assets/Tester/Resources/local-api-keys.json)
+Assets/Tester/Resources/
+Assets/Tester/Resources.meta

Subtester/Assets/Tester/Scripts/LocalApiKeys.cs

@@ -0,0 +1,69 @@
+using UnityEngine;
+
+namespace RevenueCat.Tester
+{
+    /// <summary>
+    /// Loads RevenueCat API keys from a JSON resource file and applies them to the Purchases component.
+    /// This allows local development without modifying inspector settings.
+    /// </summary>
+    public static class LocalApiKeys
+    {
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
+        private static void ApplyLocalKeys()
+        {
+            var keysAsset = Resources.Load<TextAsset>("local-api-keys");
+            if (keysAsset == null)
+            {
+                return;
+            }
+
+            var purchases = Object.FindFirstObjectByType<Purchases>();
+            if (purchases == null)
+            {
+                return;
+            }
+
+            try
+            {
+                var keysData = JsonUtility.FromJson<ApiKeysData>(keysAsset.text);
+
+                bool anyKeyApplied = false;
+
+                if (!string.IsNullOrEmpty(keysData.apple))
+                {
+                    purchases.revenueCatAPIKeyApple = keysData.apple;
+                    anyKeyApplied = true;
+                }
+
+                if (!string.IsNullOrEmpty(keysData.google))
+                {
+                    purchases.revenueCatAPIKeyGoogle = keysData.google;
+                    anyKeyApplied = true;
+                }
+
+                if (!string.IsNullOrEmpty(keysData.amazon))
+                {
+                    purchases.revenueCatAPIKeyAmazon = keysData.amazon;
+                    anyKeyApplied = true;
+                }
+
+                if (anyKeyApplied)
+                {
+                    Debug.Log("[LocalApiKeys] Applied local RevenueCat API keys from Resources/local-api-keys.json");
+                }
+            }
+            catch (System.Exception ex)
+            {
+                Debug.LogError($"[LocalApiKeys] Failed to parse local-api-keys.json: {ex.Message}");
+            }
+        }
+
+        [System.Serializable]
+        private class ApiKeysData
+        {
+            public string apple;
+            public string google;
+            public string amazon;
+        }
+    }
+}

Subtester/README.md

@@ -1,11 +1,40 @@
-### Subtester sample app
-This is a sample Unity app that has RevenueCat setup. 
-In order to use it: 
-- Video instructions: https://www.loom.com/share/bf8d07331a5b43c083efdf6b0f3ec724
-
-1. Open the project with Unity
-1. Open the Main scene
-1. Select the PurchasesManager, and make sure that it has a PurchasesListener and Purchases object attached. If they're not attached, remove other objects from the PurchasesManager and add a PurchasesListener and Purchases object. 
-1. Set the RevenueCat API key in the Purchases object
-1. Set the appUserId if needed in the Purchases object
-1. Set the Parent Panel, Button Prefab and Customer Info Label objects in the PurchasesListener. 
+# Subtester Sample App
+
+A sample/tester app for the RevenueCat Unity SDK. This project imports the SDK packages via local UPM file references in `Packages/manifest.json`, so edits to `RevenueCat/` and `RevenueCatUI/` in the repo are picked up live during development.
+
+## Requirements
+
+- **Unity Editor**: 6000.2.6f2 (see `ProjectSettings/ProjectVersion.txt`)
+
+## Setup
+
+1. Open the project in the Unity Editor (6000.2.6f2).
+2. Open the scene: `Assets/Scenes/Main.unity`
+3. Configure RevenueCat API keys:
+   - **Option A (Local JSON)**: Copy `local-api-keys.example.json` to `Assets/Tester/Resources/local-api-keys.json` (this path is gitignored), fill in your keys, and save. The app will load them at runtime.
+   - **Option B (Inspector)**: Select the Purchases component in the scene and set the API keys directly in its inspector fields.
+
+## How It Works
+
+The app is a UI Toolkit–driven tester built around `TesterApp.cs`. It displays a tab bar with screens for each major SDK feature area:
+
+- **Identity**: Manage app user ID and customer identity.
+- **Offerings**: Browse available offerings and products.
+- **Purchase**: Execute purchases (only works on device; no-op in editor).
+- **Customer**: View current customer information and active subscriptions.
+- **Paywalls**: Display and test RevenueCatUI paywalls with custom variables.
+- **Attributes**: Manage subscriber attributes.
+- **Tools**: Utility functions (reset user, refresh data, etc.).
+
+All screens log their output to an on-screen console.
+
+## Running on Device
+
+The RevenueCat SDK is a no-op in the Unity editor (native wrapper only exists on device). To test real SDK behavior:
+
+1. Build to an iOS or Android device, or iOS simulator.
+2. For iOS simulator, `SKConfig.storekit` is configured for StoreKit testing.
+
+## Development
+
+Edit files in `RevenueCat/` and `RevenueCatUI/`, then reload the scene or scripts in the editor—the local UPM references will pick up your changes immediately.