ration that can be used to insert pages of multiple PDF files into a base PDF file.</p>
<p>
For more complex use cases, refer the <a href="CombineFilesOperation.html">CombineFilesOperation</a>
<p>Sample Usage:</p>
<pre class="prettyprint">
<code>
 const credentials = PDFServicesSdk.Credentials.servicePrincipalCredentialsBuilder()
           .withClientId("PDF_SERVICES_CLIENT_ID")
           .withClientSecret("PDF_SERVICES_CLIENT_SECRET")
           .build(),
       executionContext = PDFServicesSdk.Executio