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The GenerateInvoice Journal: Invoicing tips, templates, and small business growth

Subscribe to learn about new features, billing best practices, and resources for freelancers and small businesses.
GenerateInvoice Team · Feb 23, 2026

What Is a P.O. Number on an Invoice?

A P.O. number (Purchase Order number) on an invoice is a reference code from your client. Learn what a P.O. number means, why clients ask for it, how to add it correctly, and why it helps you get paid faster.

GenerateInvoice Team · Feb 23, 2026

How to Write a Strong Invoice Email

Learn how to write a professional, polite, and effective invoice email that encourages fast payment. Includes ready-to-use templates, best practices, subject lines, and common mistakes to avoid.

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