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I can guide you in editing the invoice payment instructions, @ cforsythelectric.
If you referring to the message on invoice in QuickBooks Online, we can customize it through View/Edit under Action or Modify it from Sales Form.
Here's how to customize it from View/Edit.
Here's how to modify it through Sales Form:
You can refer to these articles on how to modify your invoices, estimates, and sales receipts in QuickBooks Online:
Customize invoices, estimates, and sales receipts in QuickBooks Online
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