Okta refers the clients as applications. You must grant the application access to an Authorization Server.
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Login the Okta application with your credentials.
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On the Home page, click Admin. Click the Applications tab, and then select Applications.
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Click Add Application> Create New App.
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In Platform, from the drop-down, select respective Platform.
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In Sign on method, select OpenID Connect, and then click Create.
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In General Settings, type the Application name and upload logo if required.
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In Configure OpenId Connect, add Login redirect and Logout redirect URLs.
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The Login redirect URLs are later used for PostMan too access.
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If PostMan is used add call back URL of PostMan as sign-in redirect URL.
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Select the Authorization Code and Refresh Token check box, and then click Save.
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In Client Credentials section, click Edit.
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In Client Authentication , select Use Client Authentication.
Always make a note of Client ID and Client secret.
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Click Save. In General Settings> Application, select the required Allowed Grant Types.
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Click Save and then click Back to Application present on top of the page.