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Last updated on Aug 28, 2026
Show your Customers’ Purchase Order (PO) numbers on every Invoice view, including the Invoice preview, online Invoice page, and PDF downloads. This helps streamline procurement, support internal tracking, and improve the accuracy of your billing documents.

Important: The Maxio Billing Portal feature must be enabled to use the Show PO Number option. See Set Up the Billing Portal.
From Advanced Billing, go to Config > Settings > Invoices.
Scroll down to the Document settings section and check the Show PO Number box.

Click Save.
The default label is “Purchase Order Number.” Customize the label text under Language Settings if you prefer a different term, such as “PO #” or “Purchase Ref.”
After turning this on, preview an Invoice to make sure the PO Number appears and is aligned the way you want.
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