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Know your target for accessing OPEN_ID Login Server / Rest URL.
Typically it’s like .
https://your-OKTA-server-url/.well-known/openid-configuration
Check developer documentation for more details:
https://developer.okta.com/code/rest/
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Test it with a "REST Client in browser" (for example, YARC! Extentions in Chrome) or open URL in Browser.
Output of this URL should be a JSON Document which contains all needed OpenID Specification information.
The picture below shows an example.
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Download the certificate from OKTA-Server for HTTPS communication.
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Select the Certificate on top.
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Click
View Certificate
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Click
Copy to file
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Follow the Wizard to download the certificate as BASE-64 encoded X.509 (.CER) to your server.