Update application credentials instructions for google calendar OAuth (#22980)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

source/_integrations/google.markdown

@@ -28,24 +28,26 @@ This section explains how to generate a Client ID and Client Secret on
 1. First go to the [Google Developers Console](https://console.developers.google.com/start/api?id=calendar)
 1. The wizard will ask you to choose a project to manage your application. Select a project and click continue.
 1. Verify that your calendar API was enabled and click 'Go to credentials'
-1. When it gets to the Page titled _Add credentials to your project_ just click cancel.
-1. Navigate to APIs & Services (left sidebar) > Credentials
-1. Click on the field on the right of the screen, 'CONFIGURE CONSENT SCREEN', select "External" and create.
-1. Set the 'Application Name' (the name of the application asking for consent) to anything you want. We suggest `Home-Assistant`.
-1. You then need to select a `Support email`. To do this, simply click the drop down box and select your email address.
-1. You finally need to complete the section: `Developer contact information`. To do this, simply enter your email address (same as above is fine).
-1. Scroll to the bottom and click `save`. (You don't have to fill out anything else)
-1. You will then be automatically taken to the OAuth consent screen, you do not need to add any scopes here so click `SAVE AND CONTINUE` to move to the `Test users` page. You will need to add the Gmail address you will be using with this integration as a test user before you will be allowed to use the API. Once you have added your email address under `Test users` click `SAVE AND CONTINUE` which will take to the 'Summary' page (you do not need to do anything here).
-1. Click Credentials in the menu on the left hand side of the screen, then click `+ Create credentials` (at the top of the screen), then select `OAuth client ID`.
-1. Set the Application type to `TV and Limited Input` and give this credential set a name (like "Home Assistant Credentials") then click 'Create'.
-1. You will then be presented with a pop-up saying 'OAuth client created' showing `Your Client ID` and `Your Client Secret`. Make a note of these (for example, copy and paste them into a text editor) as you will need to put these in your `configuration.yaml` file shortly. Once you have noted these strings, click `OK`. If you need to find these credentials again at any point then simply navigate to `APIs & Services` > `Credentials` and you will see `Home Assistant Credentials` (or whatever you named them in the previous step) under `OAuth 2.0 Client IDs`. To view both the `Client ID` and `Client secret`, click on the pencil icon, this will take you to the settings page for these credentials and the information will be on the right hand side of the page.
-1. We need to double check that the "Google Calendar API" has been automatically enabled. To do this, select `Library` from the menu, then search for "Google Calendar API". If it is enabled you will see `API Enabled` with a green tick next to it. If it is not enabled, then enable it.
+1. Navigate to APIs & Services (left sidebar) > [Credentials](https://console.cloud.google.com/apis/credentials)
+1. Click on the field on the right of the screen, **OAuth Consent Screen**.
+1. Select **External** and **Create**.
+1. Set the *App Name* (the name of the application asking for consent) to anything you want e.g.  *Home Assistant*.
+1. You then need to select a *Support email*. To do this, simply click the drop down box and select your email address.
+1. You finally need to complete the section: *Developer contact information*. To do this, simply enter your email address (same as above is fine).
+1.  Scroll to the bottom and click **Save and Continue**. Don't have to fill out anything else or it may enable additional review.
+1.  You will then be automatically taken to the *Scopes* page. You do not need to add any scopes here so click **Save and Continue** to move to the *Test users* page. You will need to add the Gmail address you will be using with this integration as a test user before you will be allowed to use the API. Once you have added your email address under *Test users* click **Save and Continue** which will take you to the *Summary* page. (you do not need to do anything here).
+1.  Click **OAuth consent screen** again and set *Publish Status* to **Production** otherwise your credentials will expire every 7 days.
+1.  Click **Credentials** in the menu on the left hand side of the screen, then click **Create credentials** (at the top of the screen), then select *OAuth client ID*.
+1.  Set the Application type to *TV and Limited Input* and give this credential set a name (like "Home Assistant Credentials") then click **Create**.
+1. You will then be presented with a pop-up saying *OAuth client created* showing *Your Client ID* and *Your Client Secret*. Make a note of these (for example, copy and paste them into a text editor) as you will need these shortly. Once you have noted these strings, click **OK**. If you need to find these credentials again at any point then simply navigate to *APIs & Services > Credentials* and you will see *Home Assistant Credentials* (or whatever you named them in the previous step) under *OAuth 2.0 Client IDs*. To view both the *Client ID* and *Client secret*, click on the pencil icon, this will take you to the settings page for these credentials and the information will be on the right hand side of the page.
+1. Double check that the *Google Calendar API* has been automatically enabled. To do this, select **Library** from the menu, then search for *Google Calendar API*. If it is enabled you will see *API Enabled* with a green tick next to it. If it is not enabled, then enable it.
 
 {% enddetails %}
 
 {% include integrations/config_flow.md %}
 
-The integration setup will next give you instructions to enter the Application Credentials (OAuth Client ID and Client Secret) and authorize Home Assistant to access your account and Calendars.
+The integration setup will next give you instructions to enter the [Application Credentials](/integrations/application_credentials/) (OAuth Client ID and Client Secret) and authorize Home Assistant to access your account and Calendars.
+
 
 {% details "OAuth and Device Authorization steps" %}
 
@@ -81,6 +83,8 @@ to all the Google Calendars available to your linked account.
 
 If the setup process fails and you see an error message such as *Authentication code expired, please try again* you may want to try the flow again. You may also check the logs for additional error messages that may indicate a misconfiguration such as an invalid client id or secret.
 
+If you have an error with your credentials you can delete them in the [Application Credentials](/integrations/application_credentials/) user interface.
+
 ## Calendar Entities
 
 Each Google Calendar from *My Calendars* ([more info](https://support.google.com/calendar/answer/37095)) is represented as a [calendar](/integrations/calendar) entity in Home Assistant.