Generate Basic Auth Token Header for using in OAuth requests online. You can either use your own string as a clientSecret or let the tool generate a Random String for using as a ClientSecret.

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What is a Basic Auth Token?

A Basic Auth Token is generally used for requesting tokens as a part of the AuthorizationCode grant of the OAuth Token flows. The Basic Auth token is passed on the Request Header in the second step, along with the Authorization Code obtained before to obtain the necessary tokens from the OAuth server. Learn more about Authorization Code Grant and PKCE

It is also used sometimes in the ClientCredentials grant flow where the client exchanges this token for an access_token to access the secured resource. Learn more about ClientCredentials Flow