if _, ok := claims[k]; !ok { // only add to claims not update it.
				claims[k] = v
			}
		}
	}
	return nil
}

// DiscoveryDoc - parses the output from openid-configuration
// for example https://accounts.google.com/.well-known/openid-configuration
type DiscoveryDoc struct {
	Issuer                           string   `json:"issuer,omitempty"`

			HMACPassphrase:          cfg.ClientID,
			Scopes:                  strings.Join(cfg.DiscoveryDoc.ScopesSupported, ","),
			Userinfo:                cfg.ClaimUserinfo,
			RedirectCallbackDynamic: cfg.RedirectURIDynamic,
			RedirectCallback:        callback,
			EndSessionEndpoint:      cfg.DiscoveryDoc.EndSessionEndpoint,
			RoleArn:                 cfg.GetRoleArn(),
		}
	}
	return m
}