Dear friends
I found a temprary solution for QR and work fine with me and here the code that you should add to your theme to have the QR code on your invoices
you should do the following to get it work:
1- go to the Sitting> Themes
2- choose the theme you want to add the QR code to it. and click View
3- then click Copy To New Theme
4- now add the following code to your theme at your prreferd place (I inserted it in the end of the body section):
<tr>
{% for total in table.totals %}
{% if total.label == "VAT 15%" %}
{% assign t1 = total.text %}
{% endif %}
{% if total.label == "الإجمالي" or total.label == "Total" %}
{% assign t2 = total.text %}
{% endif %}
{% endfor %}
{% for field in fields %}
{% if field.label == "تاريخ الفاتورة" or field.label == "Invoice date" %}
{% assign d1= field.text %}
{%endif%}
{% if field.label == "رقم الفاتورة" or field.label == "Invoice number" %}
{% assign d3= field.text %}
{%endif%}
{% endfor %}
{%capture inv_vat %}
Supplier-Name:{{ business.name }};
VAT-ID://123456789// ;
Inv-No:{{d3}};
Inv-Date:{{d1}};
Inv-Time:{{"Today"|date: "%H:%m:%s"}};
VAT-Amount:{{t1}};
Inv-Amount:{{t2}};
{%endcapture%}
<td colspan="99" style="padding-top: 30px">
<img src="https://api.qrserver.com/v1/create-qr-code/?size=140x140&data= {{inv_vat|newline_to_br}}" style=" border: 2px solid #e4ba4e ;" >
</td>
</tr>
5- you have to change the //Insert Your VAT ID Here// with your VAT Number.
6- One note here since the Date in the program does not give the time with date I added the Time from Liquid code so every time you will click View for the invoice it will update but with the Email link and Pdf the time will captured at the moment you generate them.
7- Now change the name of the Theme to whatever you want and click Create
8- When you create the Invoice in the Edit Screen choose Custom Theme and choose the created theme above.
9- Create the Invoice and the invoice should be as in the Photo
and the result when you scan the QR code as in the photo
I hope this would help you till the developer solves it and add it to the program