I tried troubleshooting, however I am not getting anywhere, likely the hmac calculation is incorrect. Please help.

   @Test
  void testResponse() {
    final String instant = timeInGMT()
    final String host = "rms-world-check-one-api-pilot.thomsonreuters.com"
    final String gatewayUrl = "/v2/groups"
    final String url = "https://" + host + gatewayUrl
    final String apiKey = "MY-KEY"
    final String apiSecret = "MY-SECRET"
    final String dataToSign = "(request-target): get " + gatewayUrl + "\n" + "host: " + host +
        "\n" + "date: " + instant
    final String hmac = calcHmacSha256(
        apiSecret.getBytes(StandardCharsets.UTF_8),
        dataToSign.getBytes(StandardCharsets.UTF_8)
    )
    final String authorization = "Signature keyId=\"" + apiKey +
        "\",algorithm=\"hmac-sha256\",headers=\"(request-target) host date\",signature=\"" + hmac + "\""

    final OkHttpClient client = new OkHttpClient()
    final Request request = new Request.Builder()
        .url(url)
        .header("Cache-Control", "no-cache")
        .header("Authorization", authorization)
        .header("Date", instant)
        .build()

    final Call call = client.newCall(request)
    final Response response = call.execute()
    assert response.code() == HttpStatus.SC_OK
  }

  private String timeInGMT() {
    final Date currentTime = new Date()
    final SimpleDateFormat sdf = new SimpleDateFormat("EEE, MMM d yyyy HH:mm:ss z")
    sdf.setTimeZone(TimeZone.getTimeZone("GMT"))
    return sdf.format(currentTime)
  }

  private String calcHmacSha256(byte[] secretKey, byte[] message) {
    byte[] hmacSha256
    try {
      Mac mac = Mac.getInstance("HmacSHA256")
      SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey, "HmacSHA256")
      mac.init(secretKeySpec)
      hmacSha256 = mac.doFinal(message)
    } catch (Exception e) {
      throw new RuntimeException("Failed to calculate hmac-sha256", e)
    }
    return new String(Base64.encoder.encode(hmacSha256), StandardCharsets.UTF_8)
  }