API
keys are mostly used to acquire APIs client Library. When we are calling an API
using our project app, it does not access private data. This key only used to
authenticate your application for accounting purpose.
Getting API keys:
1. Go to
the Google Developers Console.
2. Select
a project, or create a new one.
3. In
the sidebar on the left, expand APIs & auth. Next, click APIs.
In the list of APIs, make sure all of the APIs you are using show a status of ON.
4. In
the sidebar on the left, select Credentials.
5. Click
Create new Key and select the appropriate key type.
Getting Client ID:
OAuth
2.0 allows users to share specific data with you while keeping their usernames,
passwords, and other information private.
To use OAuth 2.0 in
your application, you need an OAuth 2.0 client ID, which your application uses
when requesting an OAuth 2.0 access token.
1. Go to the Google
Developers Console.
2. Select a project, or create a new one.
3. In the sidebar on the left, expand APIs & auth.
Next, click APIs. In the list of APIs, make sure all of the APIs you are
using show a status of ON.
4. In the sidebar on the left, select Credentials.
5. Click Create new Client ID.
6. Select the appropriate Application Type for your project
and enter any additional information required.
7. Click Create Client ID
Client
Secrets:
The Google APIs Client
Library for Python uses the client_secrets.json file format for storing the client_id, client_secret, and
other OAuth 2.0 parameters. 
Here is an example client_secrets.json file for an installed application:
{"installed": {"client_id": "837647042410-75ifg...usercontent.com","client_secret":"asdlkfjaskd","redirect_uris": ["http://localhost", "urn:ietf:wg:oauth:2.0:oob"],"auth_uri": "https://accounts.google.com/o/oauth2/auth","token_uri": "https://accounts.google.com/o/oauth2/token"}
}
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