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Hope it helps.
Let's add a signature section to your invoices, mrsedaghati.
You can add Received by: on the Message on invoice box, so it will be printed on the invoice and your customer can sign the invoice.
You can also add the message to your invoice template, it will automatically come our every time you create invoices.
If there are other things that you need to show on your invoices, please let me know.