magento - adding static block to invoice document

Question

I would like to add the content of a Magento CMS static block to the invoice send to customer. I created a static block called my_invoice_message.

How do I push the contents into invoice and place it? the template is called /sales/order_new.html.

Answer 1

It's the same syntax as for injecting it in a cms/page :

 {{block type="cms/block" block_id="id-of-your-block" }}