Hey there!
It would be absolutely fantastic to be able to put the Contact Person's name in an email instead of the Customer's or Business Name.
I teach children, and to easily find and invoice them, I use their name as the Customer Name, but I put the parents/carers down as the Contact Person.
Yes, I can change it so the parents/carers are the customers, but this would make the invoicing process take longer because I have a few hundred students and I can't remember all of the parent's/carer's names, especially when the parents have different surnames to the child.
It wouldn't be hard to add the {{contact_person}} field as an option, would it?
