Hi [Client Name],
Hope you're doing well. I wanted to send a quick reminder about invoice [#] for [project or deliverable], which was due on [date].
I’m re-sharing the payment details below in case it helps:
- Amount: [amount]
- Due date: [date]
- Payment link or method: [link]
If payment has already been sent, feel free to ignore this note. If there is anything you need from me on the invoice, just let me know.
Best, [Your Name]