Did some work

Assets/GoogleSigninSDK/GoogleSignInManager.cs

@@ -21,7 +21,7 @@ public class GoogleSignInManager : MonoBehaviour
     {
         configuration = new GoogleSignInConfiguration
         {
-            WebClientId = "1021701058525-72qg4sbvqv3m3q7it4eck2h86ekoflla.apps.googleusercontent.com",
+            WebClientId = GameConstants.WebClientID,
             RequestEmail = true,
             RequestAuthCode = true
         };

Assets/OneSignal.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: c644bc20900ca9c4e92fe5cf2fe4f557
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/OneSignal/link.xml

@@ -0,0 +1,5 @@
+<linker>
+    <assembly fullname="OneSignal.Core" preserve="all" />
+    <assembly fullname="OneSignal.Android" preserve="all" />
+    <assembly fullname="OneSignal.iOS" preserve="all" />
+</linker>

Assets/OneSignal/link.xml.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 371f5d505596bde4a8dd4d78bf0403fd
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/Dev/GameConstants.cs

@@ -14,6 +14,10 @@ public class GameConstants
     public static string OSN_Android = "3ee530aa-8613-485b-9cbd-0263727badc5";
     public static string OSN_iOS = "aabdcf42-77ef-47c3-83f7-c97a1af87a5f";
     
+    public static string WebClientID = "1021701058525-72qg4sbvqv3m3q7it4eck2h86ekoflla.apps.googleusercontent.com";
+    public static string iOS_ClientID = "1021701058525-vp54583d95oknnamu739smqfihhoivnk.apps.googleusercontent.com";
+    public static string iOS_URL_Scheme = "com.googleusercontent.apps.1021701058525-vp54583d95oknnamu739smqfihhoivnk";
+    
     
     public static string AndroidURL =
         "https://play.google.com/store/apps/details?id=com.rizze.pipuzzle&hl=en-US&ah=gfIMAf3ZQA42PzRKpRnkmyC0Sek&pli=1";

Assets/google-services.json

@@ -14,7 +14,7 @@
       },
       "oauth_client": [
         {
-          "client_id": "627393855302-c24ki5dspbaoetlldhtq118pdufcm0ku.apps.googleusercontent.com",
+          "client_id": "1021701058525-72qg4sbvqv3m3q7it4eck2h86ekoflla.apps.googleusercontent.com",
           "client_type": 1,
           "android_info": {
             "package_name": "com.rizze.pipuzzle",