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):

        private ButtonAnimationThread refreshAnimation;
        private static final Icon[] refreshSpinner = new ImageIcon[12];
        
        private static final int TIMEOUT = 5000;
        
        public static final String SERVER_KEY = "cdxServer";
        public static final String API_KEY = "cdxApiKey";
        public static final String PROJECT_KEY = "cdxProject";

        @Override
        public void registerExtenderCallbacks(final IBurpExtenderCallbacks callbacks) {
                // keep a reference to our callbacks object
                this.callbacks = callbacks;

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

Sincerely,
Emma