Zatca Phase 1 QrCode Data Generation

ZATCA E-invoicing Phase 1 QrCode data generation Samples with various programming languages

C#.Net

first we need to create an extension class for memory stream (optional step for simplify code)

public static class MemoryStreamExtensions
{
    public static void Append(this MemoryStream stream, byte value)
    {
        stream.Append(new[] { value });
    }
    public static void Append(this MemoryStream stream, byte[] values)
    {
        stream.Write(values, 0, values.Length);
    }
}

then we can do the following step

MemoryStream stream = new MemoryStream();

// Tag Length value Tuples
List<Tuple<int,string,string>> listTuple = new List<Tuple<int, string, string>>();
listTuple.Add(new Tuple<int, string, string>(1, "Seller", "Salah Hospital"));
listTuple.Add(new Tuple<int, string, string>(2, "VatNumber", "31012239350000311123"));
listTuple.Add(new Tuple<int, string, string>(3, "TimeStamp", "2023-01-01"));
listTuple.Add(new Tuple<int, string, string>(4, "InvoiceTotal", "1150.00"));
listTuple.Add(new Tuple<int, string, string>(5, "VatTotal", "150"));
foreach ( Tuple<int, string, string> msg in listTuple)
    {
// Tag into byte
    stream.Append((byte)msg.Item1);

// convert value into utf8 byte array
    byte[] utf16Bytes = utf8.GetBytes(msg.Item3);

// get length of the value byte array and convert it into byte
    stream.Append((byte)Convert.ToInt32(utf16Bytes.Length));

// append value utf8 byte array into stream
    stream.Append(utf16Bytes);

    }
byte[] data = stream.ToArray();  
// convert into base 64 string
var x = Convert.ToBase64String(data);
// we can use x as qr data
// x = AQ5TYWxhaCBIb3NwaXRhbAIUMzEwMTIyMzkzNTAwMDAzMTExMjMDCjIwMjMtMDEtMDEEBzExNTAuMDAFAzE1MA==

Dart

import 'dart:typed_data';
import 'dart:convert';

void main() {
  BytesBuilder bytesBuilder = BytesBuilder();

  List<Tlv> lst = [];
  lst.add(new Tlv(tag: 1, key: "Seller", value: "Salah Hospital"));
  lst.add(new Tlv(tag: 2, key: "VatNumber", value: "31012239350000311123"));
  lst.add(new Tlv(tag: 3, key: "Timestamp", value: "2023-01-01"));
  lst.add(new Tlv(tag: 4, key: "InvoiceTotal", value: "1150.00"));
  lst.add(new Tlv(tag: 5, key: "VatTotal", value: "150"));

  lst.forEach((element) {
   	bytesBuilder.addByte(element.tag);
	List<int> valueBytes = utf8.encode(element.value);
	bytesBuilder.addByte(valueBytes.length);
	bytesBuilder.add(valueBytes);
  });

  Uint8List qrCodeAsBytes = bytesBuilder.toBytes();
  final Base64Encoder b64Encoder = Base64Encoder();
  print(b64Encoder.convert(qrCodeAsBytes));
}

class Tlv {
  int tag;
  String key;
  String value;

  Tlv({
    required this.tag,
    required this.key,
    required this.value,
  });
}