To test the Google API, first of all, we require an access key for authentication purposes, and to get that, we should have a Client ID and Secret. In case you do not have access to those, you can follow these steps to get access to that information:
- Go to the Google API Console and set up your project if it's not there already.
- Enable the API for the Google Application that you want to test for example Gmail, or Google Drive.
- Add the required Scopes. For example, if you are testing Gmail API, we can add the "https://mail.google.com/" scope, which will give "read, compose, send, and permanently delete all your email from Gmail" permissions.
- Go to the credentials tab and get the Client ID and Secret.
Now you can use Postman or other API testing tools to perform further testing. Once we get the ID and secret you can get the access key and using this key you can access the google API. Whichever google application you wanted to test you would need the API endpoints. Suppose you are testing Gmail API, then you can get the endpoints from the Google documentation mentioned below.
Google Document: https://developers.google.com/gmail/api/reference/rest/v1/users.messages/get
You can use the API method as per the requirement like GET, POST, PUT, PATCH, and DELETE.