Custom Template – Trying to display additional Checkout field info

Hi

I have a custom invoice template as instructed in a folder in my child theme. Everything works 100%. However, I have an additional input field that I created using the Checkout field editor plugin by hightheme. I really need to display the value that the user entered in this PDF Invoice.

I have tried a few code snippets but am getting a 200 parseerror.

Is this something you are able to assist with perhaps? The input field is billing_purchase_code and is an optional input for customers. If you are able to provide a snippet of code that I might be able to use, I would be massively grateful and will buy you a virtual coffee ?

I hope you can assist easily enough.

Thanks in advance.

The page I need help with: [log in to see the link]