To access additional data from your product database you will need to add the following tag to your order delivery templates:
<Product.Column_Name> Replace Column_Name by whatever column you need to access.
This tag needs to be places between the <Product> and tag in the existing template. For example, the following tags will access a column called Password from the product database:
<Products>
<Product.Password>
</Products>
These tags are case sensitive so you will need to verify the spelling of the field names.