How to send bearer token authorization header to query REST API

What is the correct method to configure bearer token authorization header to query my REST API? I entered the token in Appgyver under HTTP Header section of config screen. In postman the bearer token is working fine. See my postman screen here with bearer token working. See my settings in appgyver here: And see the response I get in Appgyver when I test it I am getting the following error message: Error: TypeError: Failed to fetch. Does the server allow CORS?status: undefined

What is Bearer token and How it works?

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