Add subscribeProduct method

Author: mreram

Assets/Poolakey/Demo/DemoScene.unity

@@ -2144,8 +2144,8 @@ MonoBehaviour:
     m_PersistentCalls:
       m_Calls:
       - m_Target: {fileID: 1478282520}
-        m_TargetAssemblyTypeName: 
-        m_MethodName: Suscribe
+        m_TargetAssemblyTypeName: PoolakeyExample, Assembly-CSharp
+        m_MethodName: SubscribeProduct
         m_Mode: 1
         m_Arguments:
           m_ObjectArgument: {fileID: 0}

Assets/Poolakey/Demo/PoolakeyExample.cs

@@ -25,7 +25,11 @@ public void Connect()
 
     public void PurchaseProduct()
     {
-        payment.purchaseProduct("ss", null);
+        payment.purchaseProduct("test");
+    }
+    public void SubscribeProduct()
+    {
+        payment.subscribeProduct("test");
     }
 
     public void Log(string message)

Assets/Poolakey/Plugins/poolakeyunitybridge-debug.aar

@@ -21,7 +21,7 @@ public void connect()
             );
         }
 
-        public void purchaseProduct(string productId, string payload)
+        public void purchaseProduct(string productId, string payload = null)
         {
             poolakeyBridge.CallStatic(
                 "purchaseProduct",
@@ -33,6 +33,18 @@ public void purchaseProduct(string productId, string payload)
             );
         }
 
+        public void subscribeProduct(string productId, string payload = null)
+        {
+            poolakeyBridge.CallStatic(
+                "subscribeProduct",
+                getActivity(), 
+                paymentConfiguration.securityCheck.rsaPublicKey,
+                productId,
+                payload,
+                new PaymentCallbackProxy()
+            );
+        }
+
         private AndroidJavaObject getActivity()
         {
             AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");