see also https://support.docuware.com/en-us/knowledgebase/article/KBA-36931

public static int Main(string[] args)
{
	ServiceConnection DWconnection;
	
	Uri uri = new Uri("https://<>/docuware/platform");
	DWconnection = ServiceConnection.Create(uri, <username>, <password>);
	Organization DWorg = DWconnection.Organizations[0];

	// see Joe Kaufman's post for GetFileCabinetByName()
	// https://support.docuware.com/public/3b95bc76-8e31-e611-aede-f4e353f5d6d7/forum-posts?page=18&correlationId=f9f2343b-71cb-4fbe-a55a-a5f0098f1e43
	FileCabinet DWfc = GetFileCabinetByName(DWorg, <tray or file cabinet name>);
	DialogInfos dialogInfoItems = DWfc.GetDialogInfosFromSearchesRelation();
	int dialogNumber = 0;
	Dialog dialog = dialogInfoItems.Dialog[dialogNumber].GetDialogFromSelfRelation();

	int maxDocsReturned = 20;
	DocumentsQueryResult DWtrayQueryResult = DWconnection.GetFromDocumentsForDocumentsQueryResultAsync(
					DWfc.Id,
					count: maxDocsReturned).Result;
					
	foreach (Document DWtrayDoc in DWtrayQueryResult.Items)
	{
		if ( DWtrayDoc.Title == "blankPage1" )
		{
			Document documentToMergeLayers = DWtrayDoc.GetDocumentFromSelfRelation();
			int DWdocNumSections = documentToMergeLayers.SectionCount;

			for (int kindex = 0; kindex < DWdocNumSections; kindex++)
			{
				documentToMergeLayers.PutToProcessDocumentActionRelationForDocument(new DocumentActionInfo()
				{
					DocumentAction = DocumentAction.MergeAnnotations,
					DocumentActionParameters = new MergeAnnotationsParameters()
					{
						SectionNumber = kindex
					},
				});
			}
		}
	}
	return 0;
}