Create a GitHub repo secret

In your GitHub repository, go to "Settings" -> "Secrets and variables" -> "Actions".

GitHub repository settings

Add a new repository secret named LSTN_API_KEY and paste the API key generated here.

Once the secret is configured successfully, it should show up in the list of repo secrets as:

For detailed instructions on creating secrets for repositories, see the below guide:

Using secrets in GitHub Actions - GitHub DocsGitHub Docs