public com.google.cloud.vertexai.api.ApiAuth.ApiKeyConfigOrBuilder
          getClientSecretOrBuilder() {
        if (clientSecretBuilder_ != null) {
          return clientSecretBuilder_.getMessageOrBuilder();
        } else {
          return clientSecret_ == null
              ? com.google.cloud.vertexai.api.ApiAuth.ApiKeyConfig.getDefaultInstance()
              : clientSecret_;
        }
      }
<pre>
The application secret for the app registered in Azure.
</pre>

<code>.google.cloud.vertexai.v1.ApiAuth.ApiKeyConfig client_secret = 2;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SharePointSources.java