For engineering teams building internal finance tools across fintech, SaaS, and edtech, modernizing accounts payable (AP) often feels like trudging through quicksand. The core problem is rarely the payment gateway; it is the unstructured data trap of matching supplier invoices to purchase orders. AP operations typically run on a chaotic mix of hazy PDF scans, embedded email tables, and continuously shifting vendor formats. Historically, handling this meant deploying brittle OCR templates that break the moment a supplier updates their layout, or relying on manual data entry to extract and compare line items. Neither approach scales. When the objective is to check item quantities, pricing tiers, and delivery terms against configured rules, rigid legacy systems quickly become a severe operational bottleneck. Escaping these rigid workflows requires a shift toward adaptive Document AI.…