PO certification is the buyer’s confirmation that the purchase order is valid and the work against it is authorized to be paid. It’s one of the checks every invoice has to pass.
It’s usually clicked by someone on the school or agency side, not by you. That’s why it’s the most common reason a finished invoice sits: your invoice can be perfect and still wait on one person.
- Ask for it the day you submit.
- Keep each message short and friendly, and name the exact PO number and invoice number.
- Follow up about a week apart, and offer to send anything they need.
- Never assume it happened. Check.
PolarFixed AI drafts these follow-up emails for you. On PolarFixed Pro, the Payment Tracker schedules three follow-ups for an invoice and adds the reminders to your calendar.