tl;dr
Invoice ingestion is the process of receiving an invoice into an accounting or AP system, however it arrives: email, PDF upload, EDI feed, vendor portal, and converting it into structured, usable data.
Ingestion is the front door of invoice processing, and a weak one creates work downstream: a poorly extracted field means a miscoded invoice, which means a correction later. Automated ingestion that reads a wide range of formats accurately is what makes everything after it, coding, matching, approval, actually trustworthy.
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