Basically, they can fill out their business name/contact details in a profile custom field, and then I can add a variable/shortcode in the newsletter that auto populates with the value of that custom field. So it automatically adds their business name and phone number into it so they don't have to customise it later.
Is this technically possible in posts?
Or, if not I can use a custom template for the newsletter pages perhaps? Or maybe the official Xenforo resources plugin?
If it is, I am happy to be contacted by any devs here who can make it happen.