public Builder mergeClientSecret(com.google.cloud.vertexai.api.ApiAuth.ApiKeyConfig value) {
        if (clientSecretBuilder_ == null) {
          if (((bitField0_ & 0x00000020) != 0)
              && clientSecret_ != null
              && clientSecret_
                  != com.google.cloud.vertexai.api.ApiAuth.ApiKeyConfig.getDefaultInstance()) {
            getClientSecretBuilder().mergeFrom(value);
          } else {
            clientSecret_ = value;
          }
        } else {
          clientSecretBuilder_.mergeFrom(value);
        }
        if (clientSecret_ != null) {
          bitField0_ |= 0x00000020;
          onChanged();
        }
        return this;
      }
<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