Thêm watermark vào PDF qua Go SDK

	package main

	import (
		"fmt"
		"path"

		asposepdfcloud "github.com/aspose-pdf-cloud/aspose-pdf-cloud-go/v25"
	)

	// Append image watermark to a document
	func AppendNewWatermark(pdf_api *asposepdfcloud.PdfApiService, document string, imageFileName string, opacity float64, rotate float64, xPos float64, yPos float64, width float64, height float64, outputDocument string, remoteFolder string) {
		uploadFile(pdf_api, document)
		uploadFile(pdf_api, imageFileName)

		args := map[string]interface{}{
			"folder": remoteFolder,
		}

		image := asposepdfcloud.ImageStamp{
			Background:  true,
			Opacity:     opacity,
			Rotate:      asposepdfcloud.RotationNone,
			RotateAngle: rotate,
			XIndent:     xPos,
			YIndent:     yPos,
			Width:       width,
			Height:      height,
			Zoom:        1,
			FileName:    path.Join(remoteFolder, imageFileName),
		}

		_, httpResponse, err := pdf_api.PostDocumentImageStamps(document, []asposepdfcloud.ImageStamp{image}, args)
		if err != nil {
			fmt.Println(err.Error())
		} else if httpResponse.StatusCode < 200 || httpResponse.StatusCode > 299 {
			fmt.Println("Unexpected error!")
		} else {
			fmt.Println("Successfully added image watermark. ")
			downloadFile(pdf_api, document, outputDocument, "add_watermark_")
		}
	}