I have just noticed a subtle difference between using custom fields verses the new footer to add “static content”.
Using Custom fields the content is entered via the transaction edit screen and remains the same unless edited.
Using footers, if the footer static content is changed, that change will reflect in all past transactions that have that footer selected.
So, for example, if you change banks and you don’t want the bank details changed in existing completed transactions then the existing footer for bank details will need to be made inactive and a new footer created for the new bank details.