Show next invoice date field for admin
Since switching to continuous invoicing we had a number of problems with the next due date vs next invoice date.
I'd thinking that turning this option ON would sync those two fields but apparently it didn't.
One of the popular issues is invoices are being generated for the month ahead but product is being suspended because next due date (for some reason) is 1 month back in relation to next invoice date.
I think showing it on the product / addon / domain view in whmcs admin would be beneficial to debug some cases.
We'd also appreciating it being shown in red if it doesn't match the next due date.