Build the factual base
Keep the contract or order, invoice, delivery evidence, account statement and relevant messages together.
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Unpaid invoice
An invoice is unpaid. Start by checking the record.
Confirm the invoice reached the correct customer, the due date has passed, the balance is accurate and there is no unresolved credit or dispute. Then make a clear, dated chase and preserve the response.
Use proportionate next steps
Move from a friendly reminder to a firmer review only when the record supports it. Complex or contested cases may need professional advice.