private Object getClaim(Map<String, Object> payload, String claimName) {
        Object value = payload.get(claimName);
        log.debug("getClaim - {}: {}", claimName, value);
        return value;
    }
Accepts an OAuth JWT access token in base-64 encoded format, validates, and returns an
OAuthBearerToken.

@param accessToken Non-<code>null</code> JWT access token
@return {@link OAuthBearerToken}
@throws ValidateException Thrown on errors performing validation of given token
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/LoginAccessTokenValidator.java