To get Google+ App Detail, go and visit the https://console.developers.google.com/project page. You need to login in with your Google account if you aren't already. Then the Google API Console page will load and should look similar to the one shown in the image below:
Click on the "Create Project" button to get started for create project. Following popup window should be opened:
Enter Project Name and Project ID will be auto generated. After that Click on the "Create" button to create Project. The Google Developer Console Dashboard will then load as shown below:
Then, Click on "Use Google APIs". The Google API Project Services Tab will then load and click on Google+ API like shown in the image below:
You need to enable Google+ API. Click on Enable API button to enable API. See image below:
At the top left hand side of the Services page you can see a navigation. Click on the "Consent screen". It will open page like mentioned in the image below:
Note: You must have to add Email Address and Product Name on Consent Screen page. Without this info your apps will not work and always generate a invalid client id error.
At the top left hand side of the Services page you can see a navigation. Click on the Credential link. The next page should look like the one shown in the image below:
Click on "Create new Client Id", you will get one popup. Fill all the mandatory fields.
Note: When you enter the URL of your website in to the Website field, make sure that it does match the URL of your website 100%. This means, if you go to your website and then check the URL in the browser and the URL does look like http://www.domain.com then you need to enter the exact same URL. If your website URL is http://domain.com then you need to enter it that way, without using the www at the front of the name.
Important: For each WP Social plugin which integrates Google Plus you NEED to create a new Client ID and also enter an UNIQUE Authorized Redirect URIs.
The redirect URIs are always shown in the plugin settings and are as following:
Social Review Engine: http://www.yourdomain.com?wpsocial=google
Social Member Lock: http://www.yourdomain.com?wpsocialfbml=google
Social Deals Engine: http://www.yourdomain.com?wpsocialdeals=google
SEO Booster Pro: http://www.yourdomain.com
After creation of Client Id, You will get app detail. See image below:
Now, Copy the Google+ Client Id and Client Secret in to the Google+ App settings within the Plugin settings page. See image below:
Important: When you copy and paste all the needed IDs and Keys, make sure, that you don't have any empty spaces, either at the beginning nor at the end of these entries. If you have any empty spaces, then the Application won't work and will show an error message when you try to connect to the App.
After you entered the Google+ Client Id and Client Secret, click on the "Save Changes" button within the plugin's settings page.