Sign In with Apple #1340

Author: EddyVerbruggen

docs/AUTHENTICATION.md

@@ -9,7 +9,7 @@ You can sign in a user either
 * by [phone verification](#phone-verification),
 * using a [custom token](#custom-login),
 * using [Facebook](#facebook-login),
-* using [Google](#google-sign-in).
+* using [Google](#google-sign-in),
 * using [Apple](#sign-in-with-apple).
 
 Each of these login mechanisms need to be enabled in your Firebase console at the 'Login & Auth' tab.
@@ -664,8 +664,6 @@ To solve, you will want to pass in the appropriate iOS controller of the active
 ### Sign in with Apple
 First, enable Apple login in your Firebase instance.
 
-Also add the Services ID if you're not only using using Apple sign in on iOS. Make sure to follow all steps, including completing the "OAuth code flow configuration".
-
 Then add the following lines to your code and check for further setup instructions for your platform below.
 
 ```js
@@ -689,7 +687,7 @@ Then add the following lines to your code and check for further setup instructio
 #### iOS
 1. If you didn't choose this feature during installation you can remove the `platforms` and `node_modules` folders and the `firebase.nativescript.json` file, then run `npm i`. This will prompt your which Firebase features you'd like to enable.
 2. Follow [these instructions](https://firebase.google.com/docs/auth/ios/apple), including enabling Sign In for your App ID. You may need to recreate your provisioning profile as well.
-3. Add this to `app\App_Resources\iOS\*.entitlements` [as shown here](https://github.com/EddyVerbruggen/nativescript-plugin-firebase/blob/master/demo/app_resources/iOS/app.entitlements):
+3. Add this to `app\App_Resources\iOS\*.entitlements`:
 
 ```xml
   <key>com.apple.developer.applesignin</key>
@@ -698,9 +696,12 @@ Then add the following lines to your code and check for further setup instructio
   </array>
 ```
 
+[Here's a complete example.](https://github.com/EddyVerbruggen/nativescript-plugin-firebase/blob/master/demo/app_resources/iOS/app.entitlements)
+
 #### Android
 1. If you didn't choose this feature during installation you can remove the `platforms` and `node_modules` folders and the `firebase.nativescript.json` file, then run `npm i`. This will prompt your which Firebase features you'd like to enable.
-2. Follow [these instructions](https://firebase.google.com/docs/auth/android/apple), including adding your `SHA-1` hash, website association, website ownership confirmation, creating an Apple private key. Just do everything except for adding Java code, because the plugin takes care of that.  
+2. In your Firebase console add the "Services ID". Make sure to follow all steps, including completing the "OAuth code flow configuration".
+3. Follow [these instructions](https://firebase.google.com/docs/auth/android/apple), including adding your `SHA-1` hash, website association, website ownership confirmation, creating an Apple private key. Just do everything except for adding Java code, because the plugin takes care of that.  
 
 ### getAuthToken / getIdToken
 If you want to authenticate your user from your backend server you can obtain a Firebase auth token for the currently logged in user.