go get -u github.com/kazekim/promptpay-qr-go

package main

import (
    "bytes"
    "fmt"
    "github.com/kazekim/promptpay-qr-go"
    "image"
    "image/png"
    "os"
)

func main() {

  // Image is return in []byte. You should convert to image by yourself.
    qr, err := promptpayqr.QRForTargetWithAmount("0899999999","500" )

    if err != nil {
	    panic(err)
    }

  // I give an example of image convert here.
    byteToImage(*qr)

}


func byteToImage(imgByte []byte) {
    img, _, _ := image.Decode(bytes.NewReader(imgByte))

    //save the imgByte to file
    out, err := os.Create("./QRImg.png")

    if err != nil {
	    fmt.Println(err)
	    os.Exit(1)
    }

    err = png.Encode(out, img)

    if err != nil {
	    fmt.Println(err)
	    os.Exit(1)
    }
}

qr, err := promptpayqr.QRWithPromptpayLogoForTargetWithAmount("0899999999","500" )