Generating code verifier and code challenge?

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About this task

You can generate code verifier and code challenge using the Postman tool.

Procedure

Select the code challenge method and postman automatically generates the code verifier for you.

For more details, see Securing an access token with authorization code (with PKCE) grant type

If you want to create a code verifier and code challenge on your own, follow the instructions available in the PKCE RFC document RFC 7636, particularly sections 4.1 and 4.2