in webhooks-server/src/main/java/jetbrains/buildServer/webhook/WebhooksEventListener.java [120:127]
private SimpleCredentials getWebhooksCredential(ProjectEx project) {
String username = project.getInternalParameterValue("teamcity.internal.webhooks.username", "");
String password = project.getParametersProvider().get("teamcity.internal.webhooks.password");
if (username.isEmpty() || password == null) return null;
return new SimpleCredentials(username, password);
}