How do I pass oauth_consumer_secret to twitter API?

How do I pass oauth_consumer_secret to twitter API?

This is the page where twitter is explaining how to pass parameters to twitter API.
I cannot seem to find oauth_consumer_secret here.
Oauth_consumer_key is there, which is the API key, but where is the API secret in this?

https://developer.twitter.com/en/docs/basics/authentication/oauth-1-0a/authorizing-a-request

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