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Open Postman and click the Authorization tab.
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In TYPE, select Oauth 2.0 and provide a Token Name.
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Select Grant Type as the Authorization Code.
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In Callback URL, select Authorize Using Browser.
The URL is filled in.
This URL muse be registered as a Login redirect URL in Okta, as explained in Create an Okta Application.
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For the authorization URL, enter the access URL from the application details in Okta.
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Enter the Client ID and Client secret defined when you created the Okta Application.
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Type Scope & State.
Scope refers to the GUID that you have provided as Audience in Add an Authorization server.
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Click Get New Access Token.
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Enter your Okta credentials.
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Click Login.