access_token_request_body: TObject<
    {
        client_id: TString;
        code: TString;
        code_verifier: TString;
        grant_type: TLiteral<"authorization_code">;
        redirect_uri: TString;
    },
> = ...

Access Token Request body.

Once the client has obtained an authorization code, it can redeem it for an access token.