Security-related question about a possible exposed credential

[Emma-NYL]

Hello,

My name is Emma, I am conducting an academic study on possible credential exposure in public GitHub repositories.

While analyzing this repository, I found a string that may represent a credential. I'm including the code snippet below containing possible leakage. To avoid exposing sensitive information publicly, I marked the sensitive information.

Could you please help clarify whether the detected string is:

1. a real credential, or
2. a placeholder / example value?

Thank you for your time.

---

Code snippet (sensitive values masked):

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

// HMAC
public static final String username = "xxxxxx-xxx****xxxxxxxxxxx"; // Replace with API Key from email
public static final String secret = "xxxxxx-xxx****xxxxxxxxxxx"; // Replace with API Secret from email
public static final String apiUrl = "xxxxxxxxxx****xxxxxxxxxxx"; // Replace with URL from email
public String formattedDate;
public String hmacToken;
public String authHeader;

// doGet method

Thank you in advance for your time - I really appreciate it!

Sincerely,
Emma