What is a good way to combine an invoice

Does anyone know of a way to combine an invoice? A buyer bought two paintings in two days and I want to send a combined invoice to have one shipping charge. I’m supposing I have to make an all new invoice with both paintings on it but that creates confusion for the buyer since they already got two different invoices.

You could contact the buyer if they have already paid and let them know you will refund the excess charges.
Another way to do it wold be to have the buyer disregard one of the invoices and send a new one with free shipping on it.

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