In this step, you use the Client ID and Client Secret from the
previous step to log in and create an Access Token for your user.Before logging in, you should create a new request in Postman, select the GET method, and enter a Box API endpoint.
The Client ID and Client Secret credentials allow any program or piece of code to authenticate
itself to the Box API.The next step in the process is to authenticate with OAuth2.0 in Postman:
Open Postman and go to the Authorization tab.
Set the Type to OAuth 2.0.
Complete the fields, including the Client ID and Client Secret.
Click Get New Access Token.
A browser window appears where you can log in to your Box account.Once the process is complete and approved, Postman will receive your access token.