Need help on accessing Bearer token with out API

I am working on Read me integration with a custom login hook. My requirement is to redirect from the readme portal to our custom login page and once the login is completed. I will load ReadMe with authentication.

We have Login API which contains tokens to access. When I went through the reference. It was expecting some API KEY in JWT Token.

But my requirement is client will provide me Access token in the api response and they are expecting to redirect with that access token and paste it in header.

Is there any way to accomplish this requirement?

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Need help on accessing Bearer token with out API_KEY from JWT.