Agregue una marca de agua a PDF o elimine las marcas de agua agregadas previamente usando C#

using Aspose.Words.Cloud.Sdk;

var config = new Configuration
{
    ClientId = "####-####-####-####-####",
    ClientSecret = "##################"
};
var wordsApi = new WordsApi(config);

using var requestDocument = File.OpenRead("Input.pdf");
var requestWatermarkData = new WatermarkDataText()
{
    Text = "This is the watermark text",
    Layout = WatermarkDataText.LayoutEnum.Diagonal
};
var insertWatermarkRequest = new InsertWatermarkOnlineRequest(
    document: requestDocument,
    watermarkData: requestWatermarkData
);
var insertWatermarkResult =
    await this.WordsApi.InsertWatermarkOnline(insertWatermarkRequest);

var convertRequest = new ConvertDocumentRequest(
    insertWatermarkResult.Document.Values.First(), "pdf");
var convertResult = await wordsApi.ConvertDocument(convertRequest);

using Aspose.Words.Cloud.Sdk;

var config = new Configuration 
{ 
   ClientId = "####-####-####-####-####", 
   ClientSecret = "##################" 
};
var wordsApi = new WordsApi(config);

using var requestDocument = File.OpenRead("Input.pdf");
var deleteWatermarkRequest = new DeleteWatermarkOnlineRequest(requestDocument);
var response = await WordsApi.DeleteWatermarkOnline(deleteWatermarkRequest);

var convertRequest = new ConvertDocumentRequest(response.Document.Values.First(),
  "pdf");
var convert = await wordsApi.ConvertDocument(convertRequest);