Two types of invoices needed – Paid and Not Paid

The issue I am getting my head around is the need for 2 types of invoices – one for when an amount is paid, one for when payment is pending. The actual text change is minor, however, how to ensure the versions are produced and sent correctly?

a) if status = “completed” send PAID invoice in email to customer
b) if status = “on hold” (i.e. awaiting BACS payment), send DUE invoice to customer

Best regards, Brian

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